I must admit, this is a great perk to the land and sea package. You show all your documents and identification at the hotel. Once you arrive at the port, you just walk onto the ship.
We have been on two land and sea packages. Each time, we took a bus at approx 12:30 (once from the AK and once from the Poly), which arrived at the port approx one hour later. By that time, no line exists for the ship. You just walk on. They will scan your KTTW as a record that you are on the ship before you walk across the gangplank.