If you haven't played with emacs-refactor yet: https://github.com/chrisbarrett/emacs-refactor it's well worth your time. E.g. emr-el-extract-to-let is invaluable.
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Related Posts
It's odd that games often show the hours played, but I've not seen this in other apps.
"You've spent 20 hours talking to this person." Would this be a usage deterrent? If so, why do many games offer it by default?
How do you tell if a computer game is being played by a human or a computer?
Trackmania allows you to replay every keystroke. Enthusiasts have reverse engineered the game and measured what the fastest possible inputs are possible by hand!
Programmatically generating chess puzzles from a database of games played by users: