So, I am not sure I have anything new to ad, but I'll post anyway.
Let the kids set the pace. If they nap for you in the stroller go ahead and stay all day in the park, if they get crabby and don't nap in the stroller--head back to the room.
Kids seem to love the busses, monorail, pool & playground just as much as the parks themselves.
Plan your day around their natural schedule...ours are early risers so we are out for rope drop and back to the room shortly after lunch. Sometimes they napped, sometimes we swam, heck we even let them just lay around and watch TV sometimes.
Crazy, specific touring plans--consider not doing this! We did kid friendly stuff and mixed a few specific rides or things the adults wanted to do. It worked pretty well. We never knew what the 5 yr old would want to do or not do at any give moment. If we had had a big plan and she kept mucking it up we would have gotten angry with her.
It looks like you will be staying DVC this trip. I am spoiled by DVC and can't live without my 1 bedroom. We just did 11 nights at AKV and there is no way we would have done that in a normal hotel room with the 2 kids. The room was nice, we didn't mind spending time in it. Having that down time was good for the kids and our sanity.
You know your kids and while you can't know for sure how they will be at WDW, I find that our kids normal personalities are amplified there. The one that fights naps downright refuses to nap there. The one that is a bit of a scaredy cat at home is a big fraidy cat at WDW, etc.
Have fun!