We hit Chef Mickey's every trip to meet up with our favorite characters. We have never had a bad meal there and the characters are great if you like Mickey and friends. I have heard Crystal Palace is great if you like Pooh and friends. If you want to meet the princesses try either CRT or the Storybook breakfast in Epcot.
Aside from character meals we love, love, love 'Ohana at the Poly. If your family eats meat this place is great (there is also a kid's menu with fries and more simple things like burgers and chicken strips). The shrimp is to die for, I can't get enough of it. We also like The Plaza Restaurant (not the counter service Plaza Pavilion) on Main Street in MK. It is a great place to take a break and enjoy a lighter meal.
Here are the menus from both 'Ohana and Plaza Restaurant:
http://www.allearsnet.com/menu/menu_oh.htm
http://www.allearsnet.com/menu/menu_pr.htm