I think many people are freaking out about nothing. The gear simplification means there is LESS of a chance to have gear that doesn't match up to what you want. Resto and Ele will want the same pieces, since they'll actually want the same stats. No longer will look at gear with a distaste in your mouth going "ew mp5", you'll be thinking "sweet more hit!"
I'm pretty positive after the clunkiness of the few seconds of having less than ideal gear, questing, and getting better optimized gear. We'll all be screaming to the blizzard gods, thanks for the gear simplification.
Runeforging worries me however. That's spreadsheets waiting to happen. Mastery however excites me. Maybe I'll be able to get a rogue with a delicious high energy regen rate, thats individual abilities don't do much damage.
Mostly I'm just excited about the simplifications. Every change makes sense to me, and I see the reasons for them.