There's a whole thread around here someplace...
We're gluten free due to celiac. There are options everywhere. Seems like most of the character breakfasts offer GF mickey waffles. We did the Plaza Inn, and the chef came out and offered us all kinds of stuff including the gf waffles and a really nice muffin; they will cook your eggs, sausage etc. separately for you.
Not breakfast, but some other good finds we had: GF pizza at Pizza Port; gluten free pasta in a couple places; Blue Bayou did a really lovely brown dinner roll that tasted wonderful-- don't know if they're still doing that. Also I read that BB would do a Monte Cristo gluten free if you emailed ahead and asked, so I did. It was on a gluten-free hot dog bun cut diagonally, kind of weird, but it tasted quite yummy. In other places, instead of dinner rolls, they often gave us GF hamburger or hot dog buns sliced pretty and sprinkled with butter and herbs. Napa Rose does an awesome flatbread with herbs. Jolly Holiday bakery has a GF flourless chocolate cake (read: gf brownie). For desserts otherwise you're pretty limited-- we got offered creme brulee or sorbet everywhere, including Carthay circle and Napa Rose.