Hi,
I don't remember the ages of your kids, but with that in mind, here are some quick general tips -
Study maps ahead of time, to get an idea of the parks.
Don't waste time in the gift shops on Main Street in MK. Main Street usually stays open after the rest of the park and attractions close. Hit it on your way out.
As you enter DHS, grab a schedule and check any "show times" you are interested in. Next, go directly to Toy Story Mania to get Fast Passes.
Understand how rides "load," if it is a fast or slow loading ride.
For shows and 3D films, there is no need to be the first ones in line or the "holding area." If you are in the holding area, you will get into the show.
When 2 major attractions are located in the same area, grab a FP for the longer wait time, then go ride the other in the stand-by line... (Grab FP for Splash Mt., then go ride Thunder Mt. in the stand by line. Same with Rockin Roller Coaster and Tower of Terror, etc.)
Your FP will have a return time... you may ride between ____ and ____. They will accept your FP ANYTIME after the "return time," so if you are in the middle of a dinner reservations during the ride times listed, do not toss the ticket, just go back when you get a chance.
At AK, first go directly to the Safari, ride or grab a FP. Also, know that you could get wet, very wet on Kali River Rapids - might want to make it one of the last things you do at AK. (Can't remember if it offers FP.) You didn't list Mt. Everest but since you have listed roller coasters at other park, I'm betting when you kids see it, they'll want to ride... plan to grab a FP.
At Epcot, you didn't mention Soarin... can't skip Soarin!
Since you are dining at character meals, you may be able to give up some of the character meets.
I do think 2 days at MK, and 1 at each of the others will work best for your family and the amount of time you have. Also, don't cancel any of your ADR's, usually the parks with the EMH are more crowed, so your schedule might work out better.
Have fun!
