Three weeks on my work machine I disabled the arrow keys and am now forced to use C-, M-, for navigation, the first week was a bit slow I had to keep stopping and thinking, But now just three weeks later my screen movements are much more efficient and faster.
I recommend you give it a try.
That's precisely where I'm at currently -- 2 days into having the arrows disabled. It tells me what key I should have pressed relative to the arrow I pressed, but you take a second to stop and think "is that REALLY what I wanted? could I do this more efficiently?"
I've never found most of the emacs navigation keys to be particularly useful. I do not want to be hitting C-n or C-f more than one time.
I use ace-jump-mode for almost all of my movement. I can go straight to where I want to with a fraction of the effort.
Perhaps it's different for me since I use a keyboard, the Kinesis Advantage, where I don't have to move my hand to find the arrow keys.