There are a lot of ferries darting every which way, especially at transit times but I've always found them to leave you plenty of room. The water taxi captains seem to be capable and courteous. Just know the rules of the road, keep to stb if possible to let commercial traffic by. Go with the flow! There are sometimes some standing waves by the Williamsburg Bridge that are fun to go through at 10 knots.
There's a nice little anchorage behind the SOL to wait and you can wait on the Throgs side right across, just south of Kings Pt MM Academy. Download current
charts for the area on the NOAA website:Current Station Locations and Ranges
I find these current tables very helpful. They need no translation from TIDE table info. Eldridge has some very good graphic current/time images of NY Harbor.