I like cheaper, too, especially on solo trips.
MK: Columbia Harbor House or Cosmic Ray's. I've decided I prefer Cosmic Ray's over Pecos Bill's because they have barbecue sauce that I can put on my cheeseburger, and cheese for the fries. It can really become a madhouse, though. Try El Pirato y El Perico over in Adventureland for tacos and taco salads and nachos, although I am not a fan of the ground beef (personal preference) and usually order a salad or nachos without it.
AK: Flame Tree Barbecue chicken sandwich with onions!! I used to actually like the veggie pizza from Pizzafari but of course it has been discontinued. Only cheese and pepperoni are available now. My friend loves the potsticker dumplings in Asian broth from Chakarandi Chicken in Asia. I am not as crazy about them as she is, but she swears by them.
Epcot! I love eating around the world. The fish and chips in Britain are good for conventional fare. For unconventional, I like the veggie platter at Morocco's Tangierine Cafe - comes with couscous salad, olives, hummus, bread, tabouli, that kind of stuff. Yakitori House is good, too. A lot of folks like teriyaki chicken. I think it is interesting that the Mexican food at the MK is better than the Mexican food at the cantina in Epcot.
Studios: Yikes. I don't really eat here unless it's at the Brown Derby or Prime Time Cafe. The most I'll get for carryout is that I will go into the Tune In Lounge next to Prime Time and ask for a PBJ milkshake to go.