Writing Haskell with flycheck was a revelation. As-you-type linting and typechecking gives a nice tight feedback loop.
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Tweeting in emacs with https://github.com/hayamiz/twittering-mode is a revelation. The UI is far less busy, and new tweets don't distract when you're writing.
Emacs package of the day: emacs-rustfmt: https://github.com/fbergroth/emacs-rustfmt . Automatically formatting code on save is a revelation.