hier(7) accomplishes largely the same thing.

This is so truly, fantastically excellent. This should be a standard system utility!

I haven't actually tried it, but that's really nifty looking.

I made something not dissimilar, which lists all the man page sections for a given term with a brief description, to help you pick the right section.

mistake: I wrote 'any' directory, but that's not true. It has a limited set of information, but I tried to make it as complete as possible.