The only group that I can of that actively worship them are the gorlocs.

Both of them are confirmed to exist. (The Titans due to all the facilities and servants left behind by them and Elune due to certain events you'll be able to witness if you play alliance in Ashenvale and Teldrassil)

We don't know how many people on Azeroth know of this.

The night elves pray to Elune. Why not to the Titans? Because the night elves were not created by them and therefore have no reason to do so.
Vrykul and gorlocs worshiped the Titans. We don't know if other races do.

I think the vykrul stopped caring about the Titans a very long time ago.

Yeah, that's why I wrote worshiped. I probably should have said "the gnrolocs still do" instead of just "and gnorlocs"

At least 15,000 years ago, when they claim their "gods" abandoned them.

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They abandoned them when they started popping out tiny babies.

They are gods in the sense that they are god like beings. Like the real world Olympians or Aesir they sort of do their own thing. In those two cases sacrifice and tribute were often the method in which prayer was meant to meet the gods, this is not the case in WoW. Theres little evidence for prayer outside of certain groups such as worshippers of Elune or the Twilights Hammer. Prayer of the followers of the light is hinted at, but those seem to be more well wishes of safety than praying to a direct being. It's possible, and likely, in the past that the Dwarves did (with festival traditions like Wintervale) likely ritualise the memories of the Titans. In the modern era however, anyone with access to recent discoveries would realise these traditions are fruitless.

The Titan's are God like beings that are not omnipresent, omniscient or eternal. They are however immortal

Elune is a god like being that is omnipresent and immortal.

The Light is not a force but is omnipresent and divine in nature.

Naaru are simply immortal.

The Oldgods are god like beings that are omnipresent and seemingly omniscient and traditionally immortal as well as eternal

The Legion is neither omnipresent or omniscient.

The Ancients and Loa are eternal and immortal.

There is no god currently that seems to operate with the rules of the God of Abraham. To some extent the supernatural in WoW is very natural and common place, so using real world understanding or reasoning doesn't apply so naturally. Most of this is all Meta knowledge, even if beings did pray to those that cannot hear they still would fruitlessly, which is to say much how real world religion works. God like beings exist in this case with set rules and purpose behind them, that doesn't change those ignorant within the world itself.

Thanks, Voodis, great answer

Eh, I don't think Elune is omnipresent. Not sure about the Old Gods being omnipresent either.

This term implies they are everywhere in the universe.

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If she can effect events at locations she herself is not, she is omnipresent. Currently her ability can be called upon and guided like the light, if she is a physical deity she has omnipresent powers. If she can hear prayers and be called upon as well as "step in" to save people where she is not, she is omnipresent. Her ability to observe, protect, guide and play a hand in events amongst her "faithful" means exactly that. She's been presented as being exactly as omnipresent as the Oldgods, even right down to the whispering through minerals.

Hmm, I guess you're right then.

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Don't they have a life circle, transforming into Voidwalkers at their "death", or was it unconfirmed?

Mostly unconfirmed. Blizzard said that we have an unrealistic view of how often those extremely rare event's occur. They aren't all reborn in a void state, some simply die. We know that death can be final for them as well IE the sunwell sacrifice. Thus I don't assume their entire race as a whole is eternal. When wounded they simply darken and take ages to replenish their light if not out right killed, again, this is likely in Blizzard's mind a rare occurrence in upon itself, which leads me to believe they mostly outright die.

The Old Gods are the only ones worth worshipping!

Pwhn'guul i ghawl'fwata ryiu wgah uul'gwan h'iwn guu'lal.

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“Weakness and ambivalence lead to war.” - George H.W. Bush

I don't mean to get too picky, but I wouldn't say those examples necessarily suggest omnipresence. It may merely be indicative of having vast awareness and the ability to dimensionally trans/bi/multi-locate.

Case in point, the Skyfather Gods of the Marvel universe (Zeus, Odin, etc.), simply have an expansive awareness and can trans/bi/multilocate, whereas I can think of scant few beings in that universe to whom omnipresence may be accurately attributed... The One Above All, and maybe Eternity? (but limited to the main universe). IIRC, not even Phoenix Force, Galactus or the Celestials fit the bill.

Edit: The reason I bring this up is because I wonder what limitations there may be on Elune's awareness. Can it be obscured by other powerful beings (Old Gods, etc.), especially within in their own domain/strongholds?

I can't wait for the day to come when someone small rises above Titans or pulls them all down to his level.

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Well, as her power in the Nightelven faith is presented, operates much like the light, but is rather granted through the Goddess. This power is granted directly and is present everywhere at the same time, even without being called upon directly, which to some extent operates (atleast in their belief) as a global presence. As she can influence events where she is not globally, this indicates omnipresence. It might not be universal and all encompassing but it certainly is within the classic limits of omnipresence. Her omnipresence is on exactly the same level as the Oldgod's, disturbingly so. T

The power granted to followers, the acceptance of prayer and sacrifice, influencing planes of existence and guiding events. Global communication over long distance and the ability to speak directly to individuals, either through their thoughts or through magic locations (ie the crystal). As she can be called upon to intercede events, this makes her omnipresent, assuming that her power granted to followers doesn't somehow instantly stop when shes doing something else.

Of course... given the track record over the last 7 years we more than likely never even know whether or not she even exists or existed let alone the origin or form taken.

I still want to play the hell out of a Titan punching expansion.

Either Me'dan or Thrall.

She isn't just bound to Azeroth either because Night elven priest work just fine in Outland, it may be because Outland seems to be "close" to Azeroth but whatever

Or maybe the priests just believe that they are using Elune's power, while tapping into the local source of light magic.

Except Night Elven priestly magic looks totally different than the light.

Basically. Unless the light can change colours too (we have purpleish naruus so knows)

Elune's part of a cosmic joint venture, whereby her followers gain the benefits of local service providers, outside ordinary Elunarian service range.