Strict legalities aside, I find this whole privacy topic interesting generally. I personally know people who write in detail about their sex lives, marriage break-up, etc., on FB, but I am sure they would go ballistic if someone took a "street" picture of them while walking in a park. I wonder if sociologists are studying this, they must be.
To be honest, I find that a lot of the arguments about "street" photography unconvincing. I know that in general I have no right to privacy when I'm outside walking around, but somehow I don't really think that gives someone the universal right to record what I'm doing either. The law, as currently written, may give them that right, and I see the dangers of curtailing this, but something still nags me.
One thing that nags me is how people with enough money/power can circumvent this. I'm little annoyed how corporate trademark can render some otherwise public scenes up-photographable (certainly unsellable) because some logo was present in the shot. But who sold them my visual space and why wasn't I compensated for the loss? I would have nothing against by-laws forbidding corporate logos on buildings or billboards, and not just for aesthetic reasons.