I think Chef Mickey is a great place to take kids. It's a buffet so usually everyone can find something they like, softdrinks & desserts are included. Plus there's the great line up of characters including Mickey Mouse & they interact with the guests doing the napkin twirll and visit tables for pictures.
You don't have to spend time in the park visiting the characters, they come to you. Same for Crystal Palace in MK if you prefer Pooh & friends, nice buffet, softdrinks & desserts plus it's convenient to go to touring MK.
More of a dining experience I'd go with LeCellier or Chefs Le France in EPCOT. For fun try Biergarten if you like German food. Several here suggested Ohanas, if you go later then you could see the MK fireworks possibly from inside or on the beach.
ANd then there's the Hoop De Doo review, which is a dinner show that is a lot of big fun for families. Really, there's so much to choose from but it will depend upon what is available when you choose to dine. Have fun!