You can do whatever you like. Do what works for you.
I suggest if you have small kiddos breakfast in room while everyone is getting dress and going, it is easier, they will actual eat something. I have taken, breakfast bars, poptarts, fruit, milk, juice. When DD's were little we loved CBR- the little court yards were perfect for morning breakfast, we would get them dresses, then one of us would sit outside and eat with them, while the other showered and dress, then we would switch. Worked out great for us.
Character breakfast in the parks are always fun, and you can get in before the park opens- great pic's as you are walking to you ADR, Character signing, and really great breakfast.
Snack credits - WE always share snacks, in my family the 4 of us would share a snack mid day, then one later in the evening. I will note that we take our own water into the parks, and fill up the bottle as we go. I feel that a snack credit for water is a waste of a good credit. You can share ice cream, popcorn, cookies, cupcakes ect.
CS is more now than just burgers, check out the menu here or over on Allears, they had whole meals, ribs, 1/2 chicken, some of the resorts food court, offer make you own pasta, meatloaf, and other more substancial meals.
Have a magical trip.
