We got off the ship and there were tons of taxi's and shuttle buses. Since we had 4 people we just took a shuttle- due to massive amounts of luggage. We waited probably 20-30 min to get on but had no problems once we did. It was $14 pp.
Our saving grace was that we told RCL/desk on the ship, two nights before disembarking we had an early flight and they gave us the first colored tags for disembarking...which was a good thing because Newark NJ had long security lines!
We did good!