Unfortunately, you have two environmental law experts here, and this usually falls under the labour law part of the curriculum. I know a little bit about whistle-blower legislation, but not enough to give you a detailed comparison of these two, except to say that I can tell you that Ontario's whistle-blower provision in their EBR has seen only one action in 16 years.
But like a human rights provision, I think its main value is not the cases that get brought, but the ones that never have to get brought because it exists. When a company talks to their labour lawyer and is told that they can't do this, that if they do they're going to be slapped with a legal provision, it's hard to tell statistically how many actions get prevented by that, but you can tell that it would be many of them.