I think it is a good idea.
My rationale is that reducing clutter is a good thing. I don't like wasting time scrolling through page after page of a large stack of images that I have already seen. Smaller thumbnails are enough for a reference or to remind what the images were.
User interface and utility was always ingrained in me. In the early PC days there was a time when a poor interface / menus etc would not go well with established users / reviewers. Unfortunately that was let slide when the great unwashed couldn't get their head around structured things and companies like microsoft threw out all their UI research and dumbed everything down.
As long as the smaller thumbnails are still clickable for a refresher if wanted (although the link to the OP would cover that).