And there's a lot less hand-eye coordination involved in using a keyboard compared to using a mouse or touch. Better for the eyes, better for the hands.
When I started on my last corporate job one colleague caught eye of my rather widespread usage of keyboard shortcuts. So he came to my desk and asked, "Did you taught computer training classes?" When I answered negatively he remarked that "only computer class teachers use keyboard shortcuts". I had the distinct impression he was being derisive, as if knowing how to efficiently use my main everyday work tool was something to be ashamed of.
So apparently it's not that people just don't know the benefits of keyboard-based interfaces, they actively resist it as an "uncool" activity. Go figure.