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Honestly, I switched because of RSI. Other editors require a lot of chording. Hell, just look up the term "emacs finger". Some might claim that's because of poor control key positioning, but repurposing capslock is frequently not an option and doesn't totally alleviate the problem.

Switching to Vim completely eliminated those issues for me.

As a happy bonus I gained access to a lot of Vim tricks... Normal mode is basically a weird programming language, which makes it enormously powerful, particularly for repetitive tasks. And Vim macros are magical as a consequence.

Which is why when using VS or IntelliJ I adopt Vim emulation plugin of some kind. None are perfect but most are sufficient to allow me to continue to use my Vim muscle memory in more integrated environments.