I like this idea a lot. As sibling comments point out, there are kinks to work out in mapping out different website structures, and I would add the suggestion

I like this idea a lot. As sibling comments point out, there are kinks to work out in mapping out different website structures, and I would add the suggestion that greater information density could improve the UX. But just think about the collective thousands of hours spent looking for things on websites. Helping a fraction of us find things a bit faster would add up to a big impact.