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Depends on the person. I too find myself looking at text interfaces into this or that every once in a while but always come back to the same few tools: Weechat (for Slack), w3m (browser that I'm currently replying on) and vim. More recently I've been experimenting with Word Grinder which is very powerful but I don't know if it's as safe as Google Docs with respect to auto saving.

For me, I use these tools in my daily life because the normal internet is just too damn noisy and gamified and addicting. I'm big on the slow internet movement and browsing the internet in w3m is a huge boon to focusing on what really matters: the words.