It is the most luxurious, relaxing, romantic and amazing way to travel, period.
Unless you have a specific destination in mind to explore and need to spend extended time there, there is simply no better way to travel.
Caipirabob you are so right. My 42nd cruise sails on Saturday and I have enjoyed all 41 cruises before except one which was a smaller ship and we ran into a bad storm.
Speaking of people crammed together, that happens inside a closed titanium tube called airplane with people sitting shoulder to shoulder. One of my recent cruise on Oasis of the Seas ship, it was half a mile walk from cabin to dining room and back. That ship had a living forest on ship with 1000+ trees and bushes and birds live there permanently! Many people have no concept what a large cruise ship is like and how much space there is.