We have lots of threads on QS at DHS, and pretty much it has the worst across-the-board food in all the Disney parks...but, the burgers are exactly the same as everywhere else in the World, and the fries are the same...
ABC Commissary decreases their staffing in the evening and your wait will be ridiculously long, even if you are the only one in line -- expect 10-15 minutes just to GET your order, let alone eat it. Avoid it.
Backlot Express probably has the best options, and their sandwiches are better than the other theme park fare. Its noisy, but often not crowded at all, especially in the evening.
Pizza Planet...you'll get your food pretty quickly in the evening, but their pizza is the cardboard-pizza they serve all over WDW....kind of like a step-down from the frozen variety from your refrigerator at home
As someone suggested, appetizers at Mamma Melroses are quite fast, and you can walk in during the evening without needing reservations -- BUT, its not guaranteed, and it will still take you 30-40 minutes vs 10-15 minutes at a quickservice restaurant.
My personal suggestion -- if you are only going to be there for a couple hours, do not get ANYTHING there to eat -- either grab something on the way there (if driving, even McDonalds is better than anything at DHS) or go somewhere afterwards.