When we were there last year, our server said that we could order a refill on any if rm meals. She actually just ordered a 'refill' for my two year old so that she could have her own plate!We were told the Mickey waffles were reserved for those with allergies only. Other people have been able to get them, so, clearly, it depends on the server, I wouldn't plan my breakfast around them.
Depends on your tastes. Looks at the menus at Disneyworld.com. We tend to prefer breakfast because we are breakfast people in general plus we haven't had great experiences with the lunch and dinner kid's meals (undercooked pizza, very tiny portions, etc). But the adult entrees have been pretty tasty.