Are you staying on-site, at WDW resort?
Were you planning on dining in a park? For my DH + myself, we love the breakfast at the Yacht Club Galley. (If you are staying at the BW, Swan, Dolphin or YC or BC this is close) This has been closed for a while, but is now back open. There are no characters here, so if you're looking for that, this wouldnot be the place to go. You pay one price and go up to a buffet, or you can order alacarte.
If you're on the monorail resorts, Kona Kafe at the Poly is a good choice... great fresh pineapple juice!
We also enjoyed Boatwrights at Port Orleans Riverside.
I am getting hungry thinking about all the choice listed here!