In my view, Google are just snapping what any general member of the public can see in that place at that time anyway. It’s already “in the public domain”, so to speak.
I haven’t had the fortune to come across a staunch opposer to StreetView yet, but if I did, as I commented over at MySociety, I would ask them, “What part of your privacy goes Google StreetView encroach upon exactly?”
Sunbathing naked in your back garden? I’m your neighbour, I can see you out my window…
Walking to the shops? I’m walking my dog, I see you. We even pass each other on the pavement and say hello.
Leaving an adult video store? You’re in public, the public will see you. If you don’t like being seen, stay at home and order off the internet or by phone.
Are you an anti-StreetView kinda person? Tell me exactly what it is that makes you uncomfortable about StreetView. Am I being too dismissive, missing the point etc?