The Marketplace at the BC does have a few CS b-fast options. It's not like the other resort CS locations though.
In Epcot, I know that Sunshine Seasons has a full b-fast. I don't know of CS b-fasts in other parks.
In MK, I think Sleepy Hollow has waffles and the Main Street Bakery is good for pastries and maybe b-fast sandwiches.