Commuting from Williamsburg to the Financial District via Ferry was more of a luxury when I did it rather than the most sensical means of transportation. Obviously, that's a different route than what you're asking, but I wouldn't imagine the experience is different. The ferries can become overcrowded during rush hour, especially coming home in the nice weather months. And if you're sensitive, there is a chance for motion sickness in choppy weather. Timewise, they can sometimes save you time, so long as your destinations are near the ferry landings.

The landings aren't very mass transit accessible in my experience. So unless you live/work right near the A and B of your trip, it might just be a warm-weather luxury for you as well.

We can’t really tell you door-to-door times without knowing where the doors are! The ferry is generally a very pleasant and quick ride, but the landings are (obviously) on the river, so not necessarily the most convenient for everyone. Basically if you live right near one landing and work right near another, it’ll be great; if you’re a fair distance on one or both sides, it can be a lot longer.

The ferry is pretty fragile and there's intense pressure from the condo developers on the waterfront to kill that ferry stop entirely. Luckily if you're going to midtown, you don't really NEED the ferry - taking the G to the E or 7 is fine

As another has said I see it as a nice luxury when I have a bit of time. By far the fastest commute I've found is cycling to Court Square and getting the E, sometimes 20 minutes door to door to my office near times square

I live near a Ferry stop, I've never done the regular commute, but ride often, as I prefer it and walking vs the subway. It can be pretty nice.

To help you factor times, the time tables on the ferry's website are accurate, they are spot on with times and basically won't go faster or slower than those.

You'd always want to be at the ferry spot 8-10 minutes before your scheduled departure time. Then on the other side, M-F there's a free shuttle bus that will take you around midtown. Unless you're immedietly on both sides, this city basically has a way of making every commute around 45 minutes. Could be subway, could be ferry, could be bike, usually around 45 mins. lol.

Would I do it regularly? Yeah totally, it's a super chill ride. You can bring your bike on now without an extra fee. The ferry is the best way to travel IMO. And you can use your commuter dollars towards it. If you think you do get motion, it's not too bad, but just keep a handful of ginger candies in your bag in case you want them. And they sell beer and coffee on board too.