We did this last month. Watch from your favorite spot inside the MK. When it's over, leave and board one of the boats to one of the MK resorts. There is hardly ever a significant line and you can pick the shortest. We got right on during spring break (very peak crowds). Ride to the resorts then back to the MK. By the time you get back, the crowds are gone and you can take your choice to you destination. It's always a relaxing ride.
Depending on your schedule, you can also: Take a bus from the resort to DTD, Get off of the boat and ride the resort monorail the rest of the way, Walk to the parking lot or the TTC (from the Poly), or any of dozen's of permutations.
You can also play what we call "random bus" (I'm sure other folks may call this something different). This is where you go and get on the first bus that's sitting there with a short line. Doing this late can be a little risky but Disney is good about getting you home if you are staying onsite. It's fun and it's amazing what you can find when you aren't looking.