Blizzard didnt create a game that requires 3rd party software, the game evolved into it.
Old republic will probably also evolve into something that doesnt allow healers to stare at the bottom of the screen to be make sure they are not emptying their resources on the wrong target while getting hit by a big *** meteor...
In all honesty addons/macros is only essentiall for healers, dps and tanks can just stand and press their buttons. Healers have to pay attention to both the fight and the UI and thats fine for the moment but when fights are getting harder healers will need to be able to heal properly (mouseover).
I understand that people dont want addons/macros and i agree in the sence that BW/EA should make the game they want, not the game the customers want ("NERF FIRE ON GROUND!!!!!!!!!!!1"). However mouseover/tweeking the ui wouldnt require addons or macros, it could be implemented in the game.