Actually, no. I like WoW, and Rift, and Guild Wars 2, and SW:TOR, and City of Heroes, and a lot of other games. I don't expect an MMO to do be specifically tailored to my needs. I look for things that I can enjoy, and so far I have found them in most MMOs. Just because I maintain a positive outlook does not make me a fangirl of any of them.
If I am somewhat excited, then the reason is that GW2 (if successful) may inspire other game studies to produce MMOs that aren't WoW clones. We really don't need yet another of those, especially when it comes to gameplay.
The same I will do in WoW when everything is done; wait for the next content patch or the next expansion. A progression-based endgame does not mean that there's magically more content. Right now, in fact, I am out of things to do in WoW. I'm really baffled why people treat WoW as a game with infinite content when it is actually one of the worst performers in the "amount of actually playable content" category. WoW's strength is its progression game, which is what game development focuses on and where Blizzard does a very good job. But most of the rest of WoW's content is a bit neglected, to be honest.
As far as I know, GW1 had expansions at roughly yearly intervals (I've never played GW1 beyond Lion's Arch, so I don't know the exact details). There's nothing that stops an MMO company from releasing new content just because there's no progression game. Whether one needs an overarching goal is up for debate, especially given that even in MMOs with a progression game, most players never come even close to achieving this goal; so it can't be all that important from a business perspective.
As another example, City of Heroes also did not have an endgame for the longest time, didn't have much of a budget, and they still had 2-3 content patches annually.
---------- Post added 2012-08-11 at 10:58 PM ----------
This is something that bears repeating. There simply is no game studio that can produce content at the same pace as their most avid players devour it. It's flat out impossible.
You either have to pace your consumption of content, do some of the content repeatedly, or play multiple games.
Expectations of "I want a game like WoW, except with a new raid and half a dozen heroic dungeons every three months" are unrealistic.