We have done the express walk off the last two cruises. Much better for us. Keep the bags, do not put them out the night before. This means you will have to carry out ALL you belongings when disembarking.
Get up early and get something to eat at Cabanas. When done eating, go to your room and get ALL you belongings. Get to the 3rd or 4th deck, cannot remember what level, but it is the same level as the one you will walk on at the beginning of the cruise. Wait in line to get off the ship. Yes, there will be a line for this. As soon as ship is cleared, they open the doors and you start your disembarkation. Make sure you have all you documents ready for customs inspectors. Go through the process, and if going to the airport by bus, there will be people there to direct you to the first bus for the airport. The bus will leave as soon as it is full.
We have arrived at the airport as early as 9am. I do not condone booking a flight this early but we had plenty of time to go through security and get to our gate without having the added stress of being late.
The only downside to this would be if you have more bags than people to carry them. I.e: if it is only two of you and you have 5 bags to carry out, well, you are gonna have issues pulling this off. There will be no one to help you carry your bags for you off the ship.
Sorry for the long post.....