we just had a VERY nice, quiet sane lunch at the castle. The pot roast on a puff pastry was really yummy in a gourmet kind of way, the service was "royal" and the whole experience much upgraded from a few years ago when it was King Stefan's. We'd go back there.
If you are in the park all day you might consider an exit to the Polynesian or one of the monorail hotels, then a nice return after a rest for E-ticket night.