The plan seems to be in constant transition as it changed between what I was reading on this list and when we went (last week). We actually used 2 counter service meals for breakfast to feed 5 people. We got an adult breakfast platter of eggs, sausage, biscuit, potatoes, and bacon plus a pancake platter of 3 pancakes, bacon, and sausage. Our "desserts" for that CS meal were huge cinnamon buns. I wouldn't have known to get those if not for someone on this list suggesting it. We also got 2 bottles of orange juice. That left us 3 counter service meals to share for lunch. We could easily share a double cheeseburger and two chicken strips meals plus drinks and fries. We usually had food left over. Again, thanks to someone here we got the double cheeseburger which goes farther in sharing - because it didn't "cost" us any more than a regular hamburger. I realize you asked about breakfast in the park but thought I'd mention this since it is an option you might not have thought of. There are "bakeries" in the parks but we didn't eat there.
As for snacks and desserts, it's complicated. Nothing tells you what counts for what. We had to keep going to the checkout counter to ask. For example, at one meal several of us wanted ice cream. My husband went to ask and several items we had counted as desserts, but not as snacks. So we got the chocolate cake and pint of sorbet as desserts and got the Mickey ice cream bar as a snack. The biggest surprise to me was I thought there would be someone at a counter giving you this stuff that you could ask questions there, but the desserts/snacks/fruit were all in a self service area at POP where you had to get it yourself and then go to a checkout counter to ask questions. In the parks you could ask when you placed your order.
Another option is to buy some donuts at a grocery store (or POP even has whole boxes) and just use a snack credit to get orange juice or something.