Sometimes, time is money... or time is vacation time... It may depend on what you are going to do after the cruise. How much is it worth to wait. Not too long ago we took the AutoTrain south for a trip to WDW. When making our reservation we saw where we could pay a little extra, $50, to be one on the first 20 cars unloaded (it is now 50 cars). We went for it. Sure enough our car was one of the first few off of the train. We were standing in line waiting to check into the Contemporary Resort while they were still unloading cars from the train. We still laugh and giggle about that. It was the best $50 we spent on the trip.
We have a cruise planned out of Port Canaveral later this year and plan to spend a few days at WDW after we get off of the ship. For us, it makes sense to head to WDW asap. We're parking at the port rather than wait for a ride to an off-site location.
Another thing that helped make the decision to park at the port is Google Maps satellite photos of the off-site parking areas. A big lot behind a hotel with no fence is not my idea of a secure location.
What are your plans for after the cruise?