I live in NJ, and from 2006-2010 worked in WFC near Wall Street...While the ferry option is nice and pleasant, it used to cost about 2.5~3 times MORE expensive than the PATH train (the "subway' that connects both sides of the Hudson). Also, the duration of the commute gets cut down only about 1.5~2 minutes (as compared to when the PATH is running without delays). Overall, not really sustainable - neither in time nor money. Though, as a tourist, yeah, the ferry is nice for its views of the skyline. ;-)