We did the Grand Gathering breakfast at Tony's, and it was really great for character interaction: we saw Daisy, Donald, Goofy and Minnie--each came by the table twice. They had dancing with them too which was really fun. Then, every group got a picture with Mickey. It starts at 9; and we were not out of there until 10:30. So, if getting an early ADR so that you can get a start on touring MK is important, I would skip this one.
Its a plated, and (I think) all you can eat, so no buffet, which was nice.
Hope that helps!