Inspired by this post on the Top 10 shell commands I measured my own. I had to redo the commands though:

root:
cat ~/.bash_history | cut -d " " -f 1 | sort | uniq -c -i | sort -nr |head -10
184 emerge
49 equery
48 emacs
41 ls
21 cd
15 rm
12 revdep-rebuild
11 dispatch-conf
10 man
10 less

spaetz:
cat ~/.bash_history | cut -d " " -f 1 | sort | uniq -c -i | sort -nr |head -10
59 su
13 cd
11 emacs
10 ssh
10 mutt
10 ./Jokosher
7 ls
5 rm
5 graveman
5 eselect