I went on a cruise before COVID. The cruise line stressed washing hands to the point that it became annoying. (They have a “washy washy happy happy” song that they sing.) They had good reason to even before COVID as norovirus spreads like wildfire on cruise ships.
Overall, my cruise was a fun experience, but I don’t think I’d do it again - even setting COVID concerns aside. I’d rather go to some destination and walk around seeing the sights than be trapped on a giant boat with all those people.