My Downloads folder is one of the few that actually is clean. In fact, it's usually empty. Everything downloaded is downloaded for a reason, and gets moved to the right spot as soon as the download is complete.
When I find something I need in Downloads/old/old/older/old I am happy.
mv Downloads old && mkdir Downloads && mv old Downloads
This is assuming there aren’t any special permissions/attributes on Downloads
Stuff I download for a reason gets “put away” which leaves random things to go look at when I have nothing better to do. I was poking around in there earlier today after I moved some stuff and found all sorts of interesting things to waste a couple hours.
Probably be a different story if I tried to be organized though. It tends to collect “things I need right now and will probably never use again” and pdfs that don’t get saved to the Documents folder.