Is there any point to breaking the surveillance cameras?

There doesn't appear to be an achievement for removing cameras in Portal 2. I wondered the same thing. It is, however, fun to watch them burn with the lasers. I don't think there was a fun way to destroy cameras and other objects in the original Portal.

It has no effect, and as far as I can tell GLaDOS never reacts to you breaking the cameras; there is a related achievement in Chapter 8 where you're challenged to break monitors, however.