Ars Technica has a nice article on the twentieth anniversary of that other editor. Worth a read even if you aren’t a vi(m) enthusiast. One fact that I didn’t know—even after years and years of being a vi/vim user—is that the hjkl keys were chosen for cursor navigation because the ADM-3A terminal on which Bill Joy developed vi had arrows on those keys. The fact that they turned out to be an excellent choice for efficiency reason turns out to be an accident of history.
Even though I’ve moved on to the one-true-editor, I was a vi user for a long time and vim was certainly the best of the vi siblings.