We just got back from 2/9 cruise yesterday. Planned to rent a car, but at the last minute my wife talked to a Disney rep, who said we could use our transfer to go to Disney resort (we actually went to Downtown Disney for the day and they dropped us off right at Pleasure Island--we were there by 9:20 AM). Then we took a cab to the airport for about $35 after spending a fantastic day at DD.
Best of all, when you get off the ship, there are airline reps who check you in--so they take your luggage for you right away and you never see it again until you get home.
It was fantastic--and a lot less stressful than renting a car.