I have boarded on a Princess ship in Vancouver it is actually very fast with the medallion, like less than 5 mins not including the line wait. The waiting in line part is the longest.
That being said if there are more than 2 ships in the port the place can be a zoo. And if you have large luggage you need to take them to the basement of the building. There will be signs showing where you go. The signs have a number showing the sequence you need to go through.
If you have only carry on. You go direct to princess desk at terminal get your medallion and go direct customs and then on boat.