I second using Park n Cruise! It is actually much more convenient than parking at the port. Especially if you don't want the hassle of hauling your own luggage across parking lot terminal and to/from where you've parked!
I use a mobility scooter so handling all our luggage is difficult even though my able bodied husband does most of it.
Park n Cruise even puts my scooter on and off the shuttle for me with no disassembly.