I write everything in Emacs: code, reviews, manuscripts, lecture slides, and even recommendation letters.

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Specifically, I use Aquamacs Emacs, an emacs port for MacOS. GNU Emacs has been around since 1985, so it is just plain solid, with a huge user base for support, and thousands of packages and modes that can do anything from syntax highlighting of your favorite programming language (ess-r-mode) to psychotherapy (doctor). By using the same program for ever a fully-featured platform, I can use the same program (and thus, the same keybindings) for everything I do.

Emacs is easy to use. Configuring Emacs can be hard. Someday I will post my configuration file, which has evolved quite a bit over the last decade.