I and my family caught Covid on a cruise a couple of weeks ago. My wife and I are both vaxxed and double boosted and for us it was definitely worse than any cold or flu and I'm still not totally over it.
I hear that modified boosters should be available soon which should help.
For those who are unvaxxed it's just as bad as ever, with the saving grace being that doctors and hospitals have gotten better at treating it.
That's not surprising.
While not technically the correct way to approach it I think I'd have taken some test kits and if positive self isolate in my cabin.