My most useful skill from primary and secondary school has actually been a typing class in middle school on what I think was an IBM Selectric typewriter (or clone of it).
I type every day both on the job and off the job. Granted, I'm a basic QWERTY Bitch® who hasn't played around with other formats but I type fast enough that my coworkers frequently comment on how fast I type. Ain't nobody got time to wait for your fingers to catch up with your thought when trying to type input into a computer.