Cruising on a large luxury liner resembles the situation of Alice in Wonderland. Read Lewis Carols book.
You stand still in order to move rapidly.
Your personal situation on the ship is static. You go to the same places and do the same things. But you move from one country to another and another and another.
The ship is giant and dwarfish.
When you approach it, its site is so awesome that you do not trust your eyes. When you are accommodated, it is small in comparison to the town or village or landscape in which you move normally.
Living space is immense and boxlike.
The arenas, the pools, the restaurants, the atrium are the closest to cathedrals you find today. Your quarters are meticulously organised boxes where the architects have squeeze in a maximum of functionality into a minimum of cubic feet (of course you decide how you spend your money, can buy as much space as you want).
The ship is simultaneously shaking and un-shaking.
Fact is that each single wave shakes the ship a little bit. Fact is also that huge machinery makes sure that the waves cannot coordinate, synchronise and accumulate their tiny disturbances.
You are immersed into and removed from natures elementary forces.
Without hesitation, a couple of immense engines pull the entire scenery through the environment. But when nature puts waves atop waves atop waves and storms fall into a self-amplifying rotation, natures painfully takes over.
A cruise is a fascinating, illumination and in a strange way mildly hallucinating experience. It changes you. And there is nothing else which could replace it.