Famous Englishman, Samuel Johnson, once said,
"Being in a ship is being in jail, with the chance of being drowned."
Obviously, Sam was deathly afraid of traveling by boat. Perhaps he was somewhat claustrophobic as well. It’s certainly true that people on cruise ships or other seagoing vessels are "captive" audiences, and this may be disconcerting to some, but the joys of cruising far outweigh the disadvantages. It is one of the few ways of traveling where your transportation is also your hotel (traveling by motor home is another one), so that you can visit a number of different locations without packing and unpacking many times.
Back to the quote, perhaps if we lived in Samuel Johnson’s time, we would have also been frightened by sea travel — certainly it is much more reliable today, and we seldom have to worry about pirates, unless we’re traveling in the vicinity of Somalia.