Hi Ben, I totally understand we had the same concerns, but never found a ferry that we couldn’t get on (and with space for all). Arrive and get your ticket earlier, we usually got there about 30-45 minutes beforehand. Then go to the designated waiting space, in the waiting room the doors “at the other end” of the space to where the tickets are sold are where you’ll exit out towards the ferries (it will be obvious when you see them). It is a very orderly boarding process – the staff won’t let you crowd or queue jump etc. The Maafushi ferry has a lot of room. Bags are stored in a different area, so you won’t find bags taking up seating space and all that. I would just arrive early, wait in the designated space. If you are truly worried, then your option is to book the speedboat, but I honestly don’t think you need to worry.