I think this COVID will be like Flu or even the common cold, in that if not keeping distance or touching surfaces then touching faced/or mouth, allowing someone to sneeze on you, you run the risk of getting it. Difference is vaccines make symptoms less and help avoid hospitalization.

As to cruising, cruise ship couldn't stop the spread of Norvo virus long before COVID so how could anyone depend on them keeping any thing from spreading in those tight quarters? Maybe if you slept outside on the deck in fresh air and didn't eat you might stand a chance of survival lol.