It happens, I'm kinda going through the same thing right now, but I think that's cause of a bunch of non-WoW things too.

I know that when I hit 60 with Rathis (as he was on Kil'Jaeden) I took a few weeks off cause of burnout.

Though I'm just kinda having a character identity crisis right now and need to find myself behind a ton of defense or spell power and then I'll be ok, if you know what I mean.

Dont see myself totally quitting but right now I'm not in power WoW mode like usual.