HOW TO USE IT?
Include the following lines in your .emacs file:
(require 'keyfreq)
(keyfreq-mode 1)
(keyfreq-autosave-mode 1)
And use keyfreq-show to see how many times you used a command.
How to exclude commands?
(setq keyfreq-excluded-commands
'(self-insert-command
forward-char
backward-char
previous-line
next-line))