Columbia Harbor House - one of the better CS meals in my humble opinion...and sitting upstairs is a nice little gem.
Cosmic Rays - decent burger (for CS) and the atmosphere is just fun. Good fixin's bar.
Pinocchio's Village Haus - if you can get upstairs it has the over look on the Small World boats - only place in the MK that serves Pizza, meatball sandwich isn't the worst out there.
Also, if you like hot dogs - look for Casey's Corner - not too bad for a park hot dog.