Living in PA, it is much easier to get to and from Manhattan than Florida. Just an hour and half bus ride from Allentown the morning of sailing puts us on the ship just as the dining rooms open for lunch without getting up early and dealing with the hassle of airport security and other anxieties. Getting home is equally as easy, usually before lunchtime instead of some stupid time like 7 or 8 at night, if we are even lucky enough to get an earlier flight without delays.
As much as I like to see different ports, we've been to almost all of them in the Caribbean, and cruising is more about being on the ship than anything else.