I think you inadvertently just proved the point. The lack of environmental considerations in the past along NYC waterways as created a number of superfund sites and really gross waterways.I missed the part about NY. You mean the east river where you fall in and your skin melts off? Ya that bastion of eco management.
I'm OK with some more careful management of toxic stuff, especially when it has a cumulative effect. "A few drops in the gravel" over a long time by many boats in one areas (aka a boat yard) does make a difference.
Does the NY rule make total sense? No. But I personally don't want that stuff in my drinking water.
I don't know your painting practice but in your own words it seems relatively cavalier. But I've seen how my guy applies paint. He's pretty careful because the DEC is down the block and is at risk of fines if he's out of compliance.