DME has worked out very well for me every time I've used it...many, many times to date.
So...you need to make a prior reservation for it. DVC members can book it right online, at the DVC official site. That's what I always do.
Then, as long as you booked at least 10-14 days prior to travel, you will get an info packet in the mail. This will contain directions to the DME area, info about the service, as well as vouchers for each person listed on the reservation, and one luggage tag pp. You would affix the yellow luggage tag to your checked luggage. If you find you need more than one pp, you can ask DME to send you more. Then, say goodbye to your checked bags.
When you arrive at MCO, head to Side B of the terminal, go down to level 1 and there you will find the DME area. Your voucher will be scanned, you will be directed to the appropriate bus line. Get on the bus and go to your resort. You can expect your checked bags to be in your room up to 3 hrs after RESORT checkin, not airport checkin.
I always recommend packing essentials in a carryon bag...perhaps a change of clothes, a swimsuit, your travel documents, small toiletries. All just in case your checked luggage is misdirected by the airlines.
The average time, from gate (note that is not time of landing!!) to resort is running about 75 mins..can be less, can be more.
You do need to be staying at a Disney owned resort in order to use DME and you do need to be listed on the resort reservation.
Upon departure......you can use the RAC (remote alrline checkin) service at your resort if you are flying on a participating airline. You can check your bags and get your boarding passes issued right at the resort!!! BUT...the RAC counter is open from 5am-1pm..and you need to be completely done with your checkin no less than 3 hrs prior to flight departure time. So....if you have a morning flight, that departs earlier than 8:30am, it's going to be hard to use RAC.
Then, you can take DME back to MCO at the specified time..usually about 3 hrs prior to your flight..give or take 15 mins either way. Or, you can travel back in some other fashion.
Any other questions..just ask!!