I'm very glad you wrote this article. One of the things I feel lets harassment like this go on is that so few people (outside the circle of people who are directly affected by the harassment) are aware that it actually happens. That so many people (me included) are appalled by the experiences you write about gives me hope that we'll look out more for this sort of behavior in the future.
Public anti-harassment policies at conferences are a good first step towards making our community more inclusive. I hope that within our lifetimes, we get to see a world in which these policies are no longer needed.