Hi,
I hope you don't mind a long post.
I'm in the public transit camp. Because of a retinal detachment a few days before my 17th birthday and the resulting surgery, I was forbidden to take driver ed that fall, and never took lessons. I therefore need to be extremely careful that where I vacation allows me to get around cheaply and easily without a car. That's partially why WDW, with the 75th-largest transit agency in the United States, is one of my favorite vacation destinations. I am very familiar with New Jersey Transit, Port Authority Transit Corporation (PATCO, which runs a commuter train called the Speedline between downtown Philadelphia, PA and seven Camden County, NJ towns (note to our British friends: a county in the United States is the equivalent of an English shire)), and the Southeastern Pennsylvania Transportation Authority (SEPTA, which operates an underground train, an elevated train, five streetcar lines, 125 bus routes and seven regional rail lines in Philadelphia and the surrounding counties of Bucks, Chester, Delaware and Montgomery. Two regional rail lines terminate, respectively, in Trenton, NJ and Wilmington, DE).
I used the Massachusetts Bay Transit Authority (MBTA or "T") while in Boston June 8-11, 2001; Washington, DC's Metro, and Pittsburgh's Port Authority of Allegheny County transit this past summer. One of the reasons I'd love to visit London, UK is that the Tube (and public transit in Europe) is generally so good. The best public transit system I've experienced is DC's. It is clean and efficient, much like Disney Transit. Boston's is the oldest in the Western Hemisphere, dating from 1897. New York's Metropolitan Transit Authority (MTA) is the largest in the world, with 468 subway stations--subways are what Americans call underground trains--, 26 subway lines and 300 local and express bus routes.
I will take a taxi as only a last resort, because you pay more just to get into one than you do for a ride on most public transportation. I have nothing against cars; I just can't drive.
Jim