'Mouse copy' is neat way of editing sexps, based on a design from Lisp Machines: https://www.mail-archive.com/gnu-emacs-sources@gnu.org/msg00393.html
This lets you copy the sexp under your mouse cursor and paste it at point. Saves a few precious keystrokes!
Full implementation here:
miniblog.
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I'm experimenting with live-evaluating tests in my programming language project.
It's relatively fiddly to hook up a UI for this, but it saves a precious keystroke to run the tests! I'm hoping that it results in more, better tests due to the convenience.
GitHub enables you to do a ton via the browser, but AFAICS there's no way to rebase a pull request you've opened against someone's repo.
This is really handy when upstream has fixed tests. I've used it in some $JOB environments and it saves a few precious clicks.
Full disk encryption saves a lot of hassle. You no longer need to worry about further encrypting precious data, such as SSH key passwords.