I continue to use 'hjkl' to navigate in vi(m) because using the arrow keys requires me to move my whole arm. This is an awkward movement that requires time for my fingers to find the arrow keys. When using 'hjkl' to navigate, my right hand is always on home row, ready to either navigate or start typing. When typing in non-vi text boxes (such as this one), I do this movement, but I don't like it.

I do have an inefficiency: I move my hand for the escape key (which I should remap to caps lock, but I've never gotten around to it in the past decade), but I pivot at the elbow. It's far less awkward.