I was a hard-core WoWer for 4 years, and it was one of few bright spots in a run of depressing, sick years. But I finally hit a saturation point, between having a computer that's not really strong enough for Lich King (and that I can't afford to upgrade/replace right now, and...I'll pull the rest of this parenthetical digression into its own paragraph below) and feeling like I'd assimilated a few too many rules revisions. I'm back to focusing on tabletop RPGs online with select friends.
The rest of that parenthetical: I don't have a lot of money. My needs are well provided for, I don't lack for anything essential to my well-being, but I have to be careful with choosing luxuries. (Particularly with now saving for upcoming transition costs.) The computer I have works great for my work (which is writing), and for my net uses, and music, and videos, and all that stuff, and I am very satisfied with it. I dropped WoW partly because it was making me unhappy with my computer, and I don't want to be unhappy with a unit that works so well for me for everything else.
I'll enjoy some MMO again when I can sensibly afford a machine that's current for whenever it, I'm sure. And in the meantime I'm very grateful for the excitement and escape that WoW provided me.