I'm actually using Johnny decimal now, except that I ended up using 100 buckets instead of 10 because some of the categories simply had too many items in them and they would have overflowed or had no room to grow in them otherwise.

It's so nice to have a good system and never doubt where to find something and where to put a new thing.

I switched from our previous mess to Johnny decimal by using a python script that processed a table in an emacs org mode file. The script filled the rows in the table with the file and directory names and I could then assign a category to each file or directory and say what the script should do to them. Then the script showed the outline of my Johnny decimal system so I could check that's what I wanted. This made it easy to play around with possible categories for all my existing stuff until I was satisfied. In the end it copied all the files to their new home.

Thanks for creating Johnny Decimal.