I am booked for my family of 4- 5/31-6/7. We arrive around 1:00 PM to Orlando and are staying at the Poly. Currently we have 6 day park tickets but I'm debating adding a day or 2 to either our arrival or departure day. Our flight out on 6/7 leaves at 6:30 PM. Would you go to a park on either/both of those days? Would it be worth it for a few hours?
IMO, it would depend on your kids ages and how far you're traveling from, and how long your trip is going to be. I know myself, if I was going to have to be up and out of the house at say 4:00 am to drive two hours to an airport etc... I'm probably going to want the rest of my day to be pretty low key. I'd probably book a character dinner for that night to kick off the vacation and then spend the rest of the day unpacking, swimming in the pool and getting rested up to attack Disney
But, if you have a short drive to the airport, short travel time, and you're not going to be exhausted from traveling, you have older kids that can handle more hustle and bustle, then go for it.
Remember, that if your flight it due to land at 1:00, realistically you probably won't make it to MK until 2:30 or 3:00 depending on how "on time" you arrive, by the time you get off the plane, get your luggage, get picked up by
MDE, drive 30 minutes to the park/resort etc etc...
As for your depature day, yes, I would definitely be going to a park that day!!!