The perfect day at WDW ... from 8 - 11? ...
Well, I'd be waking up around 6:30am in the Wilderness Lodge. Don't look at me like that, I always wake up early at WDW because I want to be at the parks when they open. I'd shower, dress, do my hair, grab a muffin and juice or something quick and leave around 7:30 for MGM.
At MGM I'd get a FP for Tower of Terror, but still wait in line for it. Then I'd go over to Rock N' Roller Coaster, get a FP for that, too, and stand in line for it. After RnRC I'd run over to ToT with my FP and then back to RnRC with my FP. From there I'd be off to Epcot, and it's around 10am. (I'm 100% serious, it doesn't take that long for me to do stuff.)
I'd wait in the singles line for TT because that line moves way too slow. Then I'd go over to Mission: Space. After that I'd make my way around World Showcase, making stops at my favorite countries only which are Germany, Italy!!!, France, and England, enjoying a late lunch from Italy. I'd buy more of my awesome French perfume. Talk to the hot guy that was at England, if he's still there... I'd probably be ready to leave mid-afternoon, probably 2:30ish, to MK.
First off I'd get my picture taken in front of the Castle because it's tradition. Then I'd make my way over to Pirates of the Caribbean. And then FP Splash Mountain, wait in line for Big Thunder and then go back over to Splash. From there it's on to the Haunted Mansion. After that I'd grab a FP for Peter Pan (because, I'll be honest, I adore that ride!) and book it on over to Space Mountain. After that I'd go on Peter Pan and grab something quick for dinner while sitting on the curb of Main Street for SpectroMagic. Then I'd get ice cream from the Parlor and make my way to the front of the Castle to watch Wishes. After Wishes I'll probably make one last trip to Splash (because it is my favorite Mountain) and then one last round on Pirates of the Caribbean. When I'm making my way out of MK I'll stop and browse the shops, purchasing the SpectroMagic CD and a picture frame.
In all honesty ... That's what we did on our last day there in March. All of that can be done. If you don't mind your feet feeling like they're going to fall off and being so tired that you just want to sleep on the sidewalk. The last day is always the saddest but by far the most fun because we ride all of our favorite rides and see the best shows, Spectro and Wishes.