Just did this on Saturday. We left the room by 11am. Because we had a credit card on file, we didn't even have to go to the front desk. We went over to Airline bag check, weighed our bags to check them, and then went to Luggage storage area (POFQ has this area for carry on storage....we didn't use Bell services) and checked in 3 carry on bags. Then went to Epcot for lunch, returned about 1pm to the resort, went back to luggage storage to get our two back packs, left the 3rd carry on in storage, and changed into our bathing suits to sit by the pool until dinner time. Then after changing and eating, we picked up our final bag and was outside waiting for Magic Express. The earlier bus had not come yet so when it arrived before our scheduled one, we asked if they had room for us to take the earlier bus. The driver was very nice and let us do so.
Unfortunately, our flight was delayed 45 minutes, but it gave us time to relax at the airport before take off.
LOVE LOVE LOVE the way Disney helps us enjoy every minute of our time on the property. I can't say enough positive about how nice the people in the luggage area were to work with in keeping things safe while we continued to play. I'd do it all again. Better than rushing out of bed to get to the airport.
Happy Vacationing!!!