It really depends what you are after. Our kids just love the breakfasts at IHOP and if you are anywhere near Celebration the Market Street Cafe does a nice one too
Market Street Cafe - I will have to try that next time I am there. I am always on the look out for a good breakfast place.
Here is what I have found (and of course this is only MHO!)
We don't like the buffet places so tend to steer clear of them (Sizzler, Ponderosa, etc)
IHOP is OK, not WOW but OK enough.
Denny's - traditionally we have always had bad service and not wonderful food from there.
Cracker Barrel is OK for breakfast too, along with Perkins and Bob Evans (of those I think Bob Evans is slightly better or perhaps we just had a slightly better experience)
Tried a Waffle House once - wouldn't go back...
The best place we found was actually way up north of Disney (about 20mins) we were directed there by a concierge when we asked about good breakfasts (their first response was Denny's and we said

). I think it was called Sweetpeas or something similar, but I can't for the life of me remember where it was located. Unfortunately, its not very convenient for trips where you are doing the parks. But if there is anyone from the area who knows of this place and can remind me where it is - it was great.
-Kay