Having worked for that company, and operated those Caravan Amphibs into and out of the 23rd Street Pier on the East River, I can tell you it's always an exciting couple of minutes. The winds are always opposite the currents, there is a multitude of floating or partially submerged objects (including the occasional body) and you're dodging fairly heavy helicopter traffic while doing a sharp 180 to avoid the Williamsburg Bridge (the "Willie-B").
And it ain't easy keeping the passengers' Guccis dry.
But it sure is fun.