Hi, Don ...
May I borrow your pencil sharpener? I thought I was good at math !!!
The taxi situation at FLL is not the best. (Awful would cover it.) This is NOT the fault of the cruise lines.
I've not flown out of FLL since 911 but once with a close departure time, I hooked a ride with some other people while my husband waited with the luggage for a cab. By the time he got there, I was almost at the front of the line. Had he been a little later, I just would have let people go in front of me.
If you purchased transfers from the cruise line, DEFINITELY one of you should go ahead to get in line. The bus-loading is tedious and time-consuming.
Realistically, you should have sufficient time. I am not certain about Northwest, but other airlines at FLL open special podiums (podia?) checking in a single flight when that flight's departure time is drawing near.
You can go to the Guest Relations desk during your cruise with tickets in hand, explain your concerns, and you may be given a priorty tag to debark. HAL does an excellent job of getting people off the ship. It's just those darned cabs !!!
Make life easier by checking ALL your luggage, not messing with roll-aboards.
pamda -- CM First-Time Cruisers Editor