~20 year Dvorak user here. Comfort remains the chief benefit. I'm maybe faster than I was on QWERTY but not significantly.

I'm also a ~15 year Vim user, and I'm happy using its keys where Dvorak puts them even if the HJKL arrows are a little jumbled. To my muscle memory it's a solved problem.

If you're going to learn an alternative keyboard layout and also a modal editor like vim, kak, hx, etc. I suggest you find your keyboard layout happy place first and pursue editors second.