treeline - 4:10 pm on Apr 17, 2013 (gmt 0)
Looking just at the clickthroughs is inaccurate.
Now when I use google image search, it lets me see the full image right there, so I seldom visit the original site, unless I'm looking for more of the same.
How much I use image search hasn't changed, but how often I click thru has been reduced. A lot.