No one said it wouldn't cost anything!
ME is a free service that runs between MCO and various DCL resorts.
DCL transfers cost $35 per person and run between the port and MCO/DCL resorts.
Yes, you can take ME back to MCO and take DCL transfers from there. You need to book ME 3 days or more in advance and you need to lie to them and fake a flight number. You can keep your luggage with you on the bus. Remember that they will require you to be on ME 3 hours before your supposed flight.
OK--I see the logic, but it is a pain! Why not just do a one way car rental? If you pick up a car at either MCO or an outlet near WDW, you can drive from your resort to the port for a whole lot less than the cost of DCL transfers and be on your own schedule. You may choose to take ME to your resort (free, and they handle the luggage). In that case, there are many car rental places in the hotels near WDW--example, Doubletree has Budget, and is a 5 minute walk from the Marketplace bus stop in Downtown Disney. The car also gives you the ability to make a stop at a store for anything you've forgotten. You can also choose to get the car at MCO and drive to WDW--if you are at Kidani Village, you even have "inside" parking!
When you get to the terminal area, you decide whether you want everyone to return the car and take the free shuttle back to the terminal or whether you want to have the driver drop the passengers and luggage at the terminal and then return the car. Works either way! Cost for a rental car--I've paid $29-93 including all taxes and fees. The $93 was when I had to have a mini-van. I'm usually under $50 for a full size car for 24 hours. Add a bit fro tolls and gas. Discounts are available at rentalcodes.com and mousesavers.com.