GPS auto-steer has been employed in agriculture for many years. Once you have it, you never go back. It is so much easier, and so much more efficient. The job of operating the tractor becomes much more enjoyable. And the rows or lines in the field are perfectly straight.
The operator is still present of course, to ensure all is ok, to make the turns, for emergencies, etc.
I realize the waterskiing speeds are much higher, but I look forward to operating the ski boat while technology not only takes care of the speed but also steering perfectly straight through the course. In fact, I can't wait.