Chef Mickey's- I have not eaten there in a few years, but since you have younger kids, it is a great place for a meal with characters.
Ohana- have not really eaten there that much
Crystal Palace- another great character meal, and the food is pretty good!
Garden Grill- just ate there last week! Very good meal, they have a number of choices, including turkey and ribs, along with potatoes, stuffing and the fish of the day, which comes with viggies. For the younger kids, you have mac&cheese, chicken fingers, and a number of other choices. It is a bit like a buffet, but they bring your choices right to your table. You also get a dessert, which is a yummy berry pie. Mickey, Pluto, Chip and Dale are the characters there, and it is a rotating restaraunt in the land, it rotates slowly past different scenes from the "Living with the Land" boat ride
Yak and Yeti- also just ate there, the food was good, although the service was not as good as normal, but it was just a problem with the waitress.
Sci Fi- I love this restraunt, as you get to sit in a car, and it is like you are really at a Drive-in. They have a big screen where they play old Sci-Fi clips, and the food is great as well.
Whispering Canyon Cafe'- one of my favorites for thanksgiving. Both the food and service is great!
In all, great choices. For counter service, I would also reccomend Cosmic Rays in the Magic Kingdom, along with Pacos Bills. In Epcot, the sunshine seasons in the land is also great, but there is plenty of wonderful food around world showcase. In the Studios, the Backlot, and Animal Kingdom, Flame Tree.