I too would definately recommend T-Rex Cafe if you are looking for a sit down location. My 4.5 year old son is also EXTREMELY picky and he loves the dinosaur shaped nuggets. They are actually the same kind that are sold in the frozen food section at our local grocery store. T-Rex has a decent selection of adult fare, just not gourmet. The are also entertaining aminatronic to watch during the meal.
If you want to be a little adventurous then I would highly recommend Wolfgang Puck Express next to the Christmas Store in the Marketplace. (Not the one in the West Side.) My son also likes the chicken strips there, although not the seasoned fries. They also have a great selection of adult food. Its "quick service" if you are on the dining plan but it is usually the best quick service meal of all of our vacations. There is also indoor and outdoor seating. Enjoy your vacation.