At Epcot, we like Sunshine Seasons in the Land building by Soarin - lots of variety and large area to sit. American Adventure also has a large seating area and I was pretty impressed with burgers. At HS we like Starring Rolls (good sandwiches and dessert) and Backlot Express is pretty good. Flame Tree BBQ at AK, and there is nice shaded seating behind it with a pretty view of EE - just watch out for birds, they can be aggressive! Went to Pizzafari in Dec. and salad was decent - I think it was chicken ceaser. At MK we like the flatbreads at Pinnochio's , Columbia HH has a quieter area to sit upstairs, and you can get QS lunch at Be Our Guest, the Beauty and Beast castle, but you need to get a reservation for that one. It is neat to see the three different rooms, and you grab a drink and silverware, but they bring the food to the table you choose, so it's kind of like TS, and it's a nice break in air conditioning. Earl of Sandwich at Disney Springs is good if you are heading there. If you check out allears.net, they have menus so you can see what types of food each place offers.
For snacks, DD and many on these boards will tell you to try a Dole Whip, which can be found in Adventureland in MK and also in AK. Frozen Lemonades in AK are also refreshing. We love Sleepy Hollow in MK for funnel cakes, waffles, and large ice cream sandwiches. Starring Rolls in HS has great cupcakes. Epcot has many treats in each country, the French Bakery has some good eclair so and pastries, and we tried a delicious caramel drink in Germany in Dec., which tasted like melted caramels - so good!(not sure if it is seasonal). And at some pt. every trip we grab a Mickey ice cream bar, a classic on a hot day, trying to eat before the chocolate melts!