Art,
I think you'll find there's always a 'jerk' trying to take pictures -- whether it's at the Springs, or at a nude beach -- some sh!t is gonna try to sneak a photo of your girlfriend. Fortunately, though you'll see an occasional tourist snapping pics from a safe distance, camera-toting voyeurs pretty much stay away from the Springs.
Lemme put it this way: I've been nekked at the Springs a couple times (LOL) and haven't seen my pic on the Internet yet.
The nice thing about the Springs is that it's difficult to conceal a camera while in close proximity to the subject matter. I wouldn't worry, unless you're a public figure and can't afford even the slightest risk. In that case, a suggestion: Paint all the windows in your home with black paint and stay there. ;-)