I did not know that there were this many divers bringing their gear on cruise ships! Every time we did, we never saw other divers (just snorkelers) and the ship crew and dock crew always commented as we walked by with our large dive backpacks, “Divers!”
They seemed surprised, I think...but really not sure how to interpret the comment.
It very much depends on the specific cruise and scheduled ports. There are usually a pretty good number of divers on cruises that stop at the better dive locations, but most of them look like snorkelers as they leave the ship because they rent the rest of the dive gear, or it is supplied as part of the excursion. This is common whether they are using the ship's or off-ship dive op. On typical cruises, there may be one or two divers besides me that have their own gear, but occasionally most of the divers are carrying their own stuff. I get a kick out of the same question I am frequently asked on the elevator or waiting in line to disembark, while dressed in full dive gear as I described earlier: "Are you going diving?" I just say "Yes, and I am really looking forward to it," while thinking "How astute of you!", or more likely "what a dumbass question!"