I'm also really good with stereograms, but I've been using this technique in "spot the difference" pictures for ages.
True story: Once, a few friends of mine were on a website where they have lots of these "spot the difference" pictures, and you can click on the differences, and once you catch all of them, you move on to the next pair of pictures. One girl was doing very well at them, but it was clear she wasn't using the eye-cross method. So I challenged her to a contest, each of us at our own computer, first to finish five sets of pictures wins. I did all five before she could finish the second one.
Pity I didn't bet money on it. Or a kiss, or something like that.