In addition to the items mentioned above, upon arrival, if you have placed the yellow tags on your bags at your home airport, and Disney is retrieving your bags, note one very important item. It will be about 3 hours after you arrive at your RESORT (not after you land) before you can expect to see your bags. It may be earlier and may even be later. Plan accordingly. It is a wonderful perk but not a quick one.
If you happen to not get the yellow tags or if you don't get enough, you can give the CM at ME check-in your claim checks and they can still claim your bags and deliver them for you. Yellow tags are not required.
If you were to opt not to let them get your bags note that MCO has 2 sides to their bags claim and some airlines arrive on the side opposite of ME. Which will mean you have to go down to bag claim, get bags and then go back up, across the terminal and back down to ME. That 3 hour wait can be a worthwhile trade if your airline is one of those that arrives on the opposite side. It's quite easy to plan to carry on everything you'd need for a few hours. It mostly depends on what time you arrive and what your plans are.
Just remember the RAC desk closes everyday at 1:00 p.m so I would be in line no later than noon with my luggage.
The logical part of this, check out is 11:00 so who wouldn't be in line by noon anyway? Sort of never understood why they'd be open much later than 1:00, quite honestly.
Every adult will need to be there too, with their ID. This is JUST like curbside check in at the airport. So they process your check in with the airline right there, and go through the secure bag process too. So all adults with need to show their ID, answer questions regarding the bags and can get their boarding passes, if you need them. Actually, they'll give you boarding passes, no matter if you need them or not. If you do not get free bags or have extra bags they can process the bag charges.