If there aren't any more nerfs to it, I think priests might just be the best class now for powerlevelling through those zones with Mind Sear. I copied a premade over, ran into ZF, and rounded up about 40 or 50 mobs and just mowed them down.

I was overall not thrilled with all the changes in Wrath but my pally + 4 shadow priest group looks like it may be a lot of fun if I make it to 75. I believe a blue said on the Blizzard forums priests might just be the best aoe class going forward (subject to nerfs of course). I'm still thinking I'll have to make 1 priest holy, or perhaps swap in one of my shamans as resto for healing duties. (Pally + priests @ lvl 51 currently, my 5x shaman are at 61.5)