Not sure, but I guess, the distinction here is active vs passive surveillance. If there's an attack on my privacy (i.e. a stalker or a bunch of ones targeting me) - that would be problematic, because I'm quite limited on (legal) options to stop that behavior.
If someone walks around the city and records everything they see, systematizing the collected data - well, we all do this. Our brains do this, our smartphones do this, some of the cars do this, and as tech progresses a number of examples would only rise. Technology just enhances our vision and memories, and I think it would be very bad idea to limit that.
Yet, I don't know the solution. I just say, that I believe "make it illegal to record things" is a bad option too - maybe not as bad as "make everyone wear garbage bags", but certainly not a good solution.
Added: I say that because I have somehow bad memory (medium-term one, like remembering dialogs after half an hour or faces of the people I met yesterday) and really happy that modern tech helps me to mitigate this issue. Obviously, I'm not thinking of spying on anyone, but I think having an ability to remember anything that happened around has a value.