Depends of your pallete, but for regular fast food (chicken, pizza etc...)
Plaza Pavillion. More quiet atomosphere than Cosmic Rays. Outdoor seating in the shade with a view of a small pond and Main Street. Kids like to watch the ducks, and last time we had a limited view of "Cinderella's Suprise Celebration" in front of the castle. Plenty of seating.
Haven't been to Pecos Bill, I'll have to try next time.