This UI needs presets (aka configurations of something that can be saved for later use through the push of a single button).

We need presets for:

-Action bar presets: how awesome would it be to be able to say, "Oh, I'm tanking? Better switch to my tanking preset!" or "I'm going to be punching the horns off of goats? Better switch to my preset for the ideal setup!"

-Gear presets: Again, press a button, you equip all of the gear you want to equip, including weapons.

Yes, I realize we can do this with macros, but that's a gigantic PITA and most players (ie the ones SE wants to bring back to the game) aren't going to put up with having to update every macro they have every time they get a better piece of gear or the next level of a spell.

I like how the system allows us to use any ability we like. We just need a better interface for managing it all, including saving it for later use so we can swap quickly, efficiently and easily without the need to update macros.

And yes, in before a parade of people telling me how macros are "teh hardcoar"...