I think that part of the "problem" with the dining plan is that, at meals, you get a lot but that doesn't help when they aren't very portable items. Sometimes it gets thrown away. At least, it wouldn't work well for my kids who end up eating small amounts often. The changes this year alleviate some of that. How a person deals the activity and appetite, individually, is going to drive how important frequency is and whether packing food is a good idea.
We don't use the
DDP but I don't pack a lot of food for the parks. I hate hauling around a bunch of stuff and don't bring water, either. I use the filtered at the soda stations in CS places. I hate the tap water, too. It's the same at our house in Tx