I read somewhere that Asians had taken over for the ugly Americans in Europe.
I mostly disagree about Cozumel. I've never run into cruise divers there. The reefs made a good rebound during the pandemic, but I think this was more due to the southern hotels being closed than cruise ships not being in port. Cruisers come in from 9 to 6, and then are gone. They rarely go back from the main drag more than one street. I'm usually diving for most of their visit, and can head to restaurants where they won't venture. The only really annoying thing I've experienced there was one ship blaring music on loudspeakers to welcome the cruisers back. I was staying in a front room at Casa Mexicana. The noise was coming through the sliding glass doors and also bouncing off the open air dining area wall, making the sound come in through the room door.
I agree with the idea of smaller ops. I've dived twice in Providencialis (not a cruise destination). First time was with a small op and was great. Second time was with an outfit that took us to the boat in a school bus. That wasn't nearly as good.