I was using Google Image search and I came across a wallpaper wabsite that had denied access to the picture to Google. All I saw in the enlarged picture field was Google's own thumbnail blown up into spectacular fuzziness. On the right, the original was listed at 1600 pixels in height.
I think a lot of webmasters out there aren't shouting like we are, but just quietly doing what they need to do to protect their work.
The more of this I see, the better the chances that Google will dream up a compromise solution; but I'm not too hopeful since Google is trying to make a dent in Pinterest's copyright infringement orgy.