I think you need to start with park hours and events and go from there.
For example, if you want to see Wishes, they may only be on one or two nights of your trip, so you would want to plan to stay or go late to the MK that day. Similarly, check to see when Fantasmic is on (if you want to see that) etc.
Also, if you will be there for a week, you may want to take a day in the middle and plan to not go to the parks and just hang out at the resort or go to a water park.
After you look at those things, you will kind of see what days would appear to be better days for doing what parks and then plan meals around that.
Many people go to the MK their first day and then plan to go back again later in the trip in order to do favs again or do what you didn't get to the first time. It's pretty much impossible to do all of the MK in a single day, so planning to go there twice is a good thing.
Also, remember that it can take a significant amount of time out of your prime touring hours day (early morning) to do a late breakfast or an early lunch. Personally, I prefer early breakfasts and/or late lunches that can practically double as early dinner.
Beth, mom to older DD (8/01) and younger DD (10/06) and always missing Leah (4/22 - 5/1/05)