I have commuted from PBI to NYC for years and it is really easy. People that do MCO or Daytona hate the commute but FLL and PBI are easy. Sprit, Airtran, Delta, United and most importantly jetblue have a lot of capacity between the areas. The buses between airports in New York make it easy although time consuming. Getting from PBI to FLL to MIA is a bit of a pain but doable. Luckily there are enough non revs you can usually find someone to spilt a car with. That said plan on sitting in the jumpseat.