I like cruising. I like that you only have to unpack once and yet travel to several destinations. I like that your food is included and it's pretty damn good food at that. I like that you can magically wake up in a different city or country every day.
I also like to think of it as travel window shopping. If you have never been to a selection of countries, you get a small taste of them for a day and then can decide if you want to return to visit them more in-depth in the future. This what we did on our honeymoon cruise, returning to Cozumel for a week several years later.
What I do not like about cruising is getting motion sick, which I have done via all methods of transportation my entire life.
In Europe, though, you can go luxury river cruising! Rivers, the cruising versus the white water type, don't make you motion sick! And because the ships are long and narrow, every room has a view. No inner cabins for the claustrophobic here!