"But you should really try to wean yourself off the bad habit of moving in insert mode."
That's just dogmatism for the sake of it. There are certainly cases where it takes less finger movement to use arrow key movement (either by character or by word) in insert mode than it would take with switching to normal mode and doing hjkl movement.
I have seven years of professional avg personal daily use of vim and never bothered to leave the arrows. I don't move so often in insert mode, I just prefer my hands the be far from each other. Ijkl maniacs should stop repeating the same refrain over and over...
My favorite tricks: o in select mode, ctrl-y in insert mode.
Still looking for a good commenter for python (NERD commenter don't work for me)
That's just dogmatism for the sake of it. There are certainly cases where it takes less finger movement to use arrow key movement (either by character or by word) in insert mode than it would take with switching to normal mode and doing hjkl movement.