Very cool. I just tried it on my own machine and got this (archlinux with lots and lots of python libraries/data junk):

Changed the command up a bit since it was including zero byte files and directories:

  sudo find / -size +0 -type f -ls | awk '{print $7,$NF}' > /tmp/filesizes
 110920 7
 111306 5
 111312 1
 111345 9
 111362 3
 130138 0
 130511 4
 131528 8
 139000 2
 152213 6

Some other interesting things (dirname is too slow...):

  cat filesizes | grep "6 " | awk '{print $NF}' | sed 's/\/[^/]*$//' | sort | uniq -c | sort -nr | head
   1607 /usr/share/man/man3
    906 /home/matt/.cache/mozilla/firefox/8jc2n3qa.default/cache2/entries
    825 /usr/bin
    808 /home/matt/.tmux/resurrect

Then again a lot of this is flawed because it's looking at /sys. Too lazy to fix it now :)