When someone says, "It helps me find my cabin," I assume that means it's like having the outside light on so when you are driving home at night it's easier to find your house. Of course, there also are people who totally forget where the cabin is if it is not right by an elevator. Maybe somebody is in a hurry and does not have time to look at numbers. Whatever the reason, I am sure those people are telling the truth.
You don't have to worry about mine bieng in bad taste. It is an announcement that I am on my first cruise (and Mom is on her first cruise too) and, drawing from the ship name, having a "Sensational Weekend In Paradise" a reference to the island Atlantis is on. Its pictures are color photos of Atlantis and the ship's exterior If anyone hates it, he or she probably hates the idea to have any door decoration unrelated to Christmas.