There are a lot of food threads - do a quick search and you'll find a lot of great advice.
If you are trying to get both parks in a single day, you'll probably want to avoid any of the table service restaurants just for time. Exiting to City Walk would also bleed a lot of extra time.
We usually eat in City Walk, but we usually do 3 days.
As far as quick service places go, in US, we enjoy a few of the places in Fast Food Boulevard (Cletus' Chicken Shack, Krusty Burger). Haven't tried the new crepe place yet, but it gets good reviews for the food (and not so great reviews on the time it can take if there is a line).
Over in IoA, we ate at Doc Sugru's once and it was pretty good.