Most things on ships can be attached to make them secure. In fact, the strangest part was on the passenger ship where the camera was part of the ship, so that it and the ship never moved, just everything that was not attached.
The ship that I took to move to France had a day like that between Gibraltar and Naples. Most of the furniture was already bolted to the floor, so the main problem was people. They had to install big ropes through all of the public rooms so that you could hang on to them as you crossed, because it was impossible to walk without holding on to something. Of course, not many people were walking around because they were all seasick, including most of the crew. For some reason, I was not.
I was on The Norway - formerly the SS France - in the Caribbean when there was a late season hurricane in the area. The ship evaded most of the really bad weather but, while the pitching wasn't as bad as shown in these films, there was a lot of unpleasant rolling. I just remember holding onto the railing while walking through the hallways.
I crossed from London to Montreal by ship when I was 19. It wasn't very big, but by then, there were few passenger ships sailing -- one Russian and one Polish, which I took. We crossed the North Atlantic in June, apparently a month when there are quite a few storms. I remember there were paper bags tucked along the railings on all the decks. I shared a windowless cabin with a Canadian girl and two Polish women from the mountains. The two women spent the entire trip lying in bed, treating their sea sickness with vodka and pepper, and lots of company. So I spent very little time there.
One morning there were only 4 of us in the breakfast room. I gave up after the grapefruit, not wanting to push my luck, but I never got sick. One English guy got on in Tilbury and didn't come up again until we got to Montreal (6 days).
And one day, there was an announcement in Polish over the loudspeakers. I do understand Polish, but have trouble with loudspeakers in any language. All I saw was that everyone went rushing out onto the same side of the ship, which began to list. When I got there, I saw that everyone had been called to see a couple of polar bears on an ice floe.
I took the night ferry from England to France the night of the devastating 1987 hurricane (dating myself, much?). I could tell things were getting rough and I started to get sick, so I headed to the toilets and locked myself in a stall. I spent the night with my head against the door, alternately moaning quietly and vomiting. We could have gone down and I wouldn't have cared less.