It's been a couple years since our last trip, so I am not crazy about losing the extra snack credit on QSDP. If nothing else, we could get water or soft drinks in the parks that way. Still, we usually had extras to use at DTD on our last day.
Previous posters gave good advice. Our choices follow...
MK - We love Columbia Harbor House and Cosmic Rays.
Epcot - Sunshine Seasons (lots of choices, almost all of them good), Kringla Og, Tangerine Cafe (really anything in WS is O.K. if you like that particular cuisine)
AK - Flame Tree, or Pizzafari if just regular pizza is O.K. (we liked it)
DHS - not as many choices here for us, but you can have pizza here (again) or burgers and fries at several locations (nothing special, but not bad, either). We always feel like DHS could use some more creative choices than the standard American fast-food fare, but we love this park and are willing to have "mundane" food choices compared to the other three parks.
DTD - Wolfgang Puck Express is very good, and we love Earl of Sandwich (which is inexpensive and thus not a "great" QSDP value, but the food is worth it).
Have a great trip...and don't forget to hunt down a few special snacks. Dole whips in MK and maybe a trip to POFQ for beignets (I probably butchered that spelling again).