I play World of Warcraft too. I started late '05, but took a long break when Cataclysm came out. Restarted my account two months ago. I'm playing very solo, though. I'm really a character-hopper...
I play Everquest II as well, and when I'm very bored a bit Runes of Magic. Tried Vanguard, but I missed Wows sense of humor.
I've played a bunch of them...like another poster, got my start with NWN on AOL 1.0. I've played Asheron's Call, Anarchy Online, EQ, Eve Online, Star Trek Online, half a dozen more. Played for about 7 years on WoW. Did a few months with Star Wars: Old Republic, but just do not have the time anymore to get really involved. Today, I might sandwich in an ME 3 or a Witcher 2 quest between writing chapters, but not getting a lot of gaming in at the moment. That might not be a bad thing.
Isn't MMORPGs like your first love? You never forget your first? Mine would be EQOA (Everquest Online Adventures). It came out for the PS2 in early 2001. I never played any game like it before. It was my gateway drug. I instantly fell into EQ2 because of it.
Played Runescape when I was younger, wasted a lot of time as a skiller on there. Quit 5-6 years ago. Made the step up to World of Warcraft 3-4 years ago. Don't have the time to play anymore though, haven't played regularly for over a year now. Still, whenever I get the urge to go back, I manage a week or 2 of pretty intense gameplay, just running through the latest content, collecting a new heirloom or whatever, before putting my account back into hibernation.