Is a small luxury cruise a good way to see multiple countries?

I’m considering a trip where I’d like to see a few places without changing hotels every couple of days. I usually do land trips, so cruising is new to me. The options I’m looking at are Silversea, Viking, and Seabourn for either the Mediterranean or Northern Europe. What appeals to me is unpacking once, having meals handled, and waking up in different ports. What worries me is feeling rushed or only getting a shallow version of each destination. For people who have done both, when does a cruise make sense and when is a land trip clearly better?