cruise is the cheapest way to cross the ocean in comfort

Transatlantic cruise is cheaper than a business class ticket to cross the ocean, plus you get all the room and board, nightly entertainment, enrichment lectures, classes, and ports. 

Of course the real cost is the time needed.

Many people have Deep Misunderstanding on cruise because they only imagine it, hear say, but never actually take a decent one to see for themselves.  There are reasons why cruise industry is growing double digits every year and only the Pandemic interrupted the growth which now is fully resumed.

Just look at the brand new Royal Caribbean's Icon of the Sea...

There are also many itineraries a cruise makes a whole lot more sense than land trip, seriously.