Well my drop zones evolve to piles, and then there’s just piles of stuff. But at least I always have a rough idea in which pile the currently desired item is.
I think a good drop zone is limited in size, so it just isn’t possible to endlessly pile up stuff.
Right now, I have a small table, which collects all those random things - and when there is no more space to put another thing, I put everything I didn’t use for some time into boxes.
Now there’s boxes full of stuff, but the room doesn’t look cluttered or messy. Progress!
And the next step would be to regularily sort through those boxes and throw stuff away… Someday. For sure.