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))