But that's just it, it was a couple of scenes with Keaton where he basically just says he tried to avoid being Batman but he can't. That's it.
Whereas Bale's Batman actually had a plot line made about it that seems to run over the three movies. In Batman Begins he saw his mission as being finite. In TDK he thought he saw the opportunity to retire the mantle when a better hero in Dent presented itself. By the end of TDK he had accepted he would always be Batman.
You cannot equate all of this to Keaton's two scenes. Bale's Batman's dilemmas in handling a life as Batman is unquestionably more fleshed out without being repetitive. Begins was all about his fears. But there was no fears addressed in TDK because all that was dealt with already. I expect TDKR to tackle it from a different angle, too.