Well, around the MK are the monorail resorts. I can vouch for Kona Cafe and O'Hana at the Poly, the Wave and Chef Mickey's at the Contemporary and 1900 Park Fare and Grand Floridian Cafe at the Grand Floridian.
Inside the MK, we like Tony's (not the most authentic Itailian on the planet but its always been good for us) and the Plaza, which is mostly sandwiches, burgers, salads and really good ice cream desserts. There is also Liberty Tree Tavern which serves a Thanksgiving type dinner. We also love Crystal Palace which has Pooh characters and a very good buffet.
If you want something more along the lines of a meal about the food, I'd go go with the Wave, Kona, or GF Cafe.
If you want characters, Chef Mickey's, or 1900 Park Fare, if you want something with a ton of food and entertainment for kids, go with O'Hana.