I don't know if any of you have ever left out of San Pedro and it may be different for Disney but...
When we went on
RCCL in April, DH dropped us off with our luggage at the port and then went to park. While he was parking, there were tons of porters there (hope you get a good one; I didn't but that's another story) so I gave him the luggage and then waited for DH to return. There are frequent shuttles so I don't think we waited more than 5 minutes for him to return and then we all walked inside and up the escalators to check in.
I am assuming that the porters will be there in force since they work for tips and we can leave our luggage with them and then line up with our noses pressed against the doors chanting
"open, open, open"

until some poor
DCL CM feels sorry for us and let's us in!
It sounded like they want all the disembarking people to be off the ship by 9 or 9:30a so anytime after that should be good. I don't think we want to get there too early since you want all those people who parked their cars last week to leave so you can get a good space!

Also, RCCL mirrors DCL's itinerary so it will twice as much people and cars~
OK - back to my chores~