Perhaps I'm naive, but I've never seen a New York job without a salary range listed. I can't tell you whether it's being vigorously enforced, but it seems to me that it's having the intended effect.

At the very least, even if enforcement is lax, it's a good piece of information for the job applicant: if you are applying for a job in NY and the posting has no salary range on it, you automatically know that employer is willing to violate the law and can make a judgement call on whether to avoid them.