I built a Lily58 for fun and to try out split keyboards, I hadn't heard too much of the hype around these kinds minimal key layouts at the time, but I really love it. Whilst I wouldn't call it an efficiency gain on the scale of going from a normal IDE to vim/nvim, it has been a huge ergonomics boost and I have found the layered keyboard approach to work really well. It's much less contorting and stretching of the hand than a standard board.

Coupled with nvim, vimium and i3 I don't really need the mouse at all, and I feel really in sync with the computing compared to a more mouse focused setup.

It did impact my accuracy for perhaps a month, but it wasn't a big deal. I type at about 120wpm before and after retraining my 20 odd years of muscle memory.

https://github.com/kata0510/Lily58. https://i3wm.org/ https://neovim.io/