I can't think of many, but I remember someone mentioning a place on Main Street that sold some kind of cinnamon loaf or something like that that they loved.
Also I once ate b-fast at the Electric Umbrella at Epcot...it was decent, nothing spectacular, but pretty good, in a fast food kind of way.
On our last trip (just my sister and myself) we brought cereal and bought milk at the resort...so we had b-fast in the room every day except once - saved a lot of time an money!
Also I just remembered...Sunshine Seasons at Epcot has a nice cs b-fast...at least to me it was nice. I got cereal and milk there once, and they also have a lot of fruit available. Not sure if they had anything hot, but the cold stuff was good for a quick breakfast. They had strawberries packaged with a liyyle tub of whipped cream...delicious!