We have stayed at SOG upwards of 25 times over the years.
Garden Grill: It provides a no frills, cheap (compared to disney) breakfast buffet, fresh made waffles, scrambled eggs, sausage, bacon, biscuits, bagels, fruit (not such a great selection), yogurts, etc. It is reasonably priced (about 10) for adults and easy. They also offer plated breakfasts if you want fried eggs, etc. for even less $.
Have not had dinner there.
Evergreens: A sports bar atmosphere, the food is average, but again, cheap. Onion rings, burgers, pizza, etc. game room, bar, etc. MUCH cheaper than disney properties if you want a quick sandwich. Average.
Manginos is an Italian place only open for dinner. The food is okay, not great, not bad, in my opinion. Service is good. Price is a bit high but the menu is creative.
There is also a starbucks coffee stand and an ice cream shop. If you have military ID you can purchase donuts, iced coffee, sodas, etc in the military exchange and there are nice sized refrigerators in the rooms.
My favorite place for a quick and super cheap breakfast is the coffee shop down by the bus depot. You literally walk through it to get to the busses. They have excellent coffee, teas, etc. and the most delicious egg croissants (you can get them with meat too), fruits and sandwiches at lunch. A coffee and huge egg and bacon croissant will set you back about 4.00. CHEAP and so good! The women who runs it is really nice.