I think the biggest reason for this is that my main server is dead. No-one is raiding anymore, or doing RBG's. I have toons on more populated servers, including Illidan (the most populated horde server) but I haven't been able to connect with others on those servers. Maybe that is what is missing, the camaraderie.
I love this game, but I'm starting to drift away, and wish desperately to regain that passion for it. Has anyone else gone through this? What did you do to become more involved again?