We have never gone more than five days in a row. We do go to all the parks most of the time. Please keep in mind YOU WILL NEVER DO IT ALL!!! That's the most important thing I think. With the right planning, you can easily take advantage of EMH, do the major attractions in the AM, plus more, take a couple hour break and go back to a park for a nice dinner and one of the night shows.
I find that the parks are very overwhelming and there's constant stimulation. We just have to go back and enjoy an afternoon break at the resort. Watch the boards and take suggestions.
I take a notebook and divide a page into the days we'll be there. Then I begin planning, first what days what park, then what meals and when, then what's the best order to do the rides to get as many done as we want. I always plan an afternoon break, and our evening revolves around a nice meal and the shows.
On the "free" day, we usually go to Disney Quest, shop at Downtown Disney, and maybe even go to one of the waterparks first thing in the AM before it gets real crowded. You can do allot in a few hours then. I'll bet the boys would like Disney Quest. Mine always did.
Our typical "off day" is to sleep in a little, get to Typhoon Lagoon at opening, do shark reef with absolutely no lines and it's neat in the AM, spend a couple hours there, and go over to Disney Quest by 11:30 when they open. Spend as long as we want there and either take a break, or walk around DD.
I also use EMH as often as possible and always get to the park at least 1/2 hour before it opens. Sounds "rigid", but it makes the rest of your day so much more relaxing and the kids really need that swim in the pool in the afternoon just to "freshen up" "body and spirits"!!!
