I realize that you already have your plans, but thought I should give you the benefit of my experience. I have a 4 yr old, and both he and my husband dawdle in the morning. I made plans where we only had to be at the parks before 10 am one day. We did character breakfasts our first 2 days, an afternoon only day the next. Then we did a 10 am fishing trip in the middle of the week, with the rest of the day at Disney Springs. Then back to the parks, afternoons only, and my son declared a rest day for what I had planned as a day to pick up stuff he missed. He would not get dressed until 4 pm!!! Part of the reason he wouldn't get ready was that he knew that it was our last day, and he thought that we would extend the trip if we didn't do anything that day.
I'm telling you this crazy story to let you know that if you are going with a young child:
* rest days are a good thing
* be prepared for illogical behaviour from your youngster
* don't be upset if your perfect plan is not appreciated by your youngster!
Older kids get the idea of trying to pack as much as possible into a day. Little kids - not really. The one piece of advice that saved me from a mental breakdown was from a guide book written by the TouringPlans guys. Think of visiting Disney as a dance. If you don't get the steps perfect, dancing can still be a lot of fun. You can't see and do everything at WDW in one trip, so don't try to, and have a good time. (I can't find the exact quote - sorry!)