I'm kinda addicted to them... The Quaker Oats Oatmeal Rasin ones anyway....
I do bring real food, well... things like beef stew, maybe a loaf of bread with a block of cheese... but I'll usually buy a shitload of granola bars and eat them regularly (forces me to drink regularly too!). I have a constant energy source, and can eat them on the go.
The only downside to them is the individual wrapper deal. I'd love to find a recipe for them, and make them in a pan like rice krispy treats - cut them into "real" portions (so cut the pan in 4 or 6 lol) and wrap them with something... maybe butcher paper or foil (burn the former, reuse the latter)?
I'll also throw in a few packs of ramen noodles, on the chance that I'm either hungry for them, or someone else underestimates their food requirements. They're cheap and light enough that it doesn't bother me, except for the bulk.
Then again, a 'weekend' bag for me consists of a poncho/shelter, nalgene bottle, metal cup (to cook in), a knife and leatherman, matches, first aid kit, whistle, bandana, spare socks, and a flashlight and spare batteries. Depending on the weather, I'll throw in a sleeping bag and extra set of clothes.