I've never really used knitted on cast on because it seemed tedious, but this week I learned a faster way of doing it.
The instructions go: Make a slip knot on your left needle. Knit a stitch, and then slip the new stitch onto your left needle: 1 stitch made.
But you actually never have to take your right needle out of the new stitch. You can just go right on and knit that stitch again. Which makes the whole operation much faster.