When you are describing the way in which someone travels, you do not say that they travel 'by the boat' or 'by the ship'. You say that they travel by boat or by ship. We are going by boat. They were sent home by ship.
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A maiden voyage generally refers to a first or the first. A ship leaving port with paying passengers for the first time is taking it's maiden voyage. If that voyage is say, from France to the US, then it's also its maiden transatlantic voyage.
You Can Visit Many Countries In One JourneyThe reason is that a ship makes stops in the ports of different countries, so you will have a chance to see many new places with your own eyes. In most cases, ?port cities have a developed infrastructure and everything needed for entertaining tourists from abroad.
Modern cruise ships now have the ability to cruise long distances and sail through bad weather. There is no need for Ocean Liners to be built just to transport people across oceans. People rarely emigrate from one continent to another in great numbers by ship, as they once did.