Frommer's list of his top 9 reasons to take cruises. I agree with all of them... but this one hit the nail on the head for me:
Reason #5: I love the shippy stuff. What is it about that ship horn moaning farewell to a port or the chirpy cruise director's voice announcing upcoming activities over the PA system? Call me a sap, but I like it. I like the hum of the engines, the sound of the wind whipping across the open decks, and the excitement of leaning over the railings to watch the ship being tied up at a pier in a new port.