I started playing in Vanilla. I did do some "somewhat serious" raiding. My guild was nearly done with BWL when TBC came out.

I take lots of breaks from the game. Anywhere from 1 month to 6 months. This keeps the game much more fresh. The novelty comes back, after a break. Even during a content lull. Sometimes my break happens when new content comes out, and then I start up again during a lull. Doesn't bother me, because it's new to me!

I still consider WoW to me one of my favorite games. Now, when I un-sub, I leave my feedback as something like "Just takin' a break. I'll be back." I've never really truly "rage quit".

Sometimes I even un-sub when I'm still into the game; RL is busy.