Adding another vote for Ale & Compass. You can't beat the deal - $23 for an entree and continental breakfast buffet. I think it's changed a bit since I've been there, but I'm still excited to go back. The atmosphere is also great since it's not bustling and loud. Great start to a day at Hollywood Studios or Epcot since you can walk from the Yacht Club.
I'd also recommend Grand Floridian Cafe. The entree I had is no longer offered, but I had a lovely table in the back room by a window. Such a nice, calming place to start the day. Had a pot of tea and some crazy good pancakes. (Orange, cranberry, pecan to be exact, and I'm still mad they're no longer on the menu.)
If you can't tell, I don't go to Disney with kids and like finding the calmer atmospheres where I can. If you're going with younger kids, these may not be the best suggestions.