Yeah, if one can afford it, it can be pretty relaxing overall, though for us the daily excursions at times were very tiring. And expensive.
I booked one in February for ten days in the Caribbean which I thought I'd never do again, but it goes to places I've never been in the eastern parts. We aim mostly to relax.
In October we're doing the Greek Isles out of Rome which my wife wanted (and it's fine with me).