It completely depends on the itinerary.
If it's just a typical Caribbean float, then who cares. As someone said, you can treat many of the stops as sea days. Essentially, the ship is the destination.
But for the Med, South America, Central America, Asia, and Europe the stops are a big part of the adventure. If for no other reason than to decide whether it's a place you'd like to return to, or to say hello again to an old friend.