It's closer to 15,000 now IIRC. And yes, it takes many years of actual driving to be "good" as opposed to "basically competent".
Driving well is trained reflexes. Not book learning and not a few hours of training and not "thinking about each move". 60 miles per hour covers a lot of ground every second. You need training in the basics. But you need to actually do it, and a lot of it, to be good at it.
Actually these days we could build realistic simulators and require 2000 hours or so in sim before the license.