My camp and I ate the entrees a lot last year. They're nice because they're calorie-dense (and when you don't want to eat, making every bite count is important). Also, if you're in a group you can cook for everyone with one pot of water and no dishes! Backpacking meals can be delicious as well, but in my experience they're WAY expensive - plus you often have to bring extra water to rehydrate them.
We did supplement pretty heavily with grilled cheese sandwiches (our staple of choice), and various comforting snack foods. I wouldn't want to live on them exclusively, but there's enough variety that I wouldn't go crazy if I had to. Some people get a kick out of cooking gourmet on the playa - more power to them! Personally, I don't have the energy to cook for myself after a day of work, let alone a day of running around in the desert. My priority is delicious calories, fast.
I found this site that has them: http://beprepared.com/quickshoplist.asp ... 20to%20Eat
Reading through to refresh my memory, I remember liking the ravoli, the tortellini, and the sausage. Some of the breakfast options were good, also. They're cheap enough that if you order a smattering now, you could sample some to find out what you like.