It wasn't 9/11 it was Disneyland Paris that caused Eisner to become very very cautious in terms of capital expenses. Eisner was great for 10 years but after that (and after his business partner Frank Wells died) he became very focused on self-preservation (retaining his own job - he's even said this) and that meant extremely conservative decision making, less risk taking, etc.
What Iger really deserves credit for is risk taking. He has made big risky decision after big risky decision. He's put it on the line because if these decision fail, then he fails. For guys like him it's not about the money anymore as they are already beyond rich, it's about the reputation and the place in history. Rather than taking the "safe" approach he has chosen to invest crazy amounts of cash and the result has been that average people (like most of us) get to experience the imagineer's absolutely most outrageous ideas.... IT DIDN'T HAVE TO TURN OUT THIS WAY.... Instead of Flight of Passage you could have had a lightly themed spinner with Banshees flying around you on strings, etc...