I like the following
Cheeseburger - Cosmic Ray's (Tomorrowland) & Pecos Bill (Frontierland) in the MK
mashed potatoes - I don't eat them at WDW
french fries - The McDonald's locations - Frontierland Fries @ MK (near Splash Mountain), Refreshment Port near Canada @ Epcot, Fairfax Fries on Sunset Blvd @ Hollywood Studios & Petrifries in Dinoland @ AK
chicken - not sure exactly what you are looking for, but the chicken strips are pretty good at any cs, also Cosmic Rays has a good grilled chicken sandwich and SciFi has a great grilled chicken sandwich too!
shakes - SciFi @ Hollywood Studios, also, although i've not been yet (trying for the 1st time this trip), I hear the Whispering Canyon @ Wilderness Lodge has good shakes (and they are all you can drink for one price).
desserts - Main Street Bakery on Main Street in the MK & Boulangerie Pattiserie in France @ Epcot, oh and if you like crepes, there is a great little crepe place alongside WS lagoon outside of France
spaghetti - I don't eat it @ WDW
ice cream - Beaches & Cream @ the Yacht & Beach Club (I highly recommend the No Way Jose if you like Peanut Butter).
eggs benedict - I don't eat eggs...EVER!
steak - Le Cellier in Canada @ Epcot (make the ADR as soon as you can, it is tough to get in!) By far the best meal overall in all of WDW!!!
ribs - Never had 'em @ WDW
hot dogs - Don't eat 'em...EVER!
pizza - I like the pizza @ Wolfgang Puck Cafe Express @ DTD, better than the cardboard pizza you might be likely to get elsewhere @ WDW
soup - Never had @ WDW
bread - Not exactly bread, but the ham & cheese croissants @ Boulangerie are excellent! Also, the breadsticks they bring prior to your meal @ Le Cellier are excellent!
sandwiches - None that I can think of.
chocolate - love Goofy's candy company @ DTD, if you can dream it, they most likely have it. Love the create your own snack, check it out....
http://www.wdwinfo.com/downtown/marketplace/goofycandyco.htm