For me it would come down to what resort you are staying at. Many have mentioned Boma, and yes it is a very good breakfast buffet; However, I personally would not want to travel all the way out to the AKL to eat breakfast there and then head to a park. IMHO, it is too difficult and would take up too much time. If you are staying at the AKL, then that would be an excellent option. I base breakfast ADR's off of which park I am visiting. If I am visiting DHS or Epcot then I personally enjoy Cape May then take the short and quick walk to Epcot or hop on the short boat ride to DHS (often walk it as well). If I am in the MK, I love Crystal Palace and a 8:00 am pre-park opening ADR. At the AK, many recommend Tusker House ( I have not tried it). A couple of other places I personally enjoy for breakfast as well have been Captains Grill (Yacht Club), Whispering Canyon (WL) and Ohana.