I'm going to really disagree with you here... the last time I went to Disney in Orlando, there were plenty of places to eat that did freshly cooked food/from scratch stuff. Yeah, there are still lots of hot dogs and burgers and chicken nuggets and candy and stuff, but we stayed at the Polynesian Resort and we had all sorts of Asian dishes and steak and spanking fresh salads and all that. We were actually very well taken care of, and there is no way I would have traded that for Mickey D's! The food folks were more than accomodating towards my dairy-allergic celiac kid (very knowledgable about cross-contamination issues and cooked their gluten-free pancakes, for example, on a dedicated griddle). While I am not a fan of plasticky theme-parks like Disney, my Second never got sick nor hungered for anything our week there.
Yeah, get out of the park a few times and eat real Floridian if you can find it, but you can still eat yourself silly there.