My experience is that it depends on where in Germany you are. I drove from France to Norway this week so I went through northern Germany and the autobahn was great, where it wasn't restricted because of the more or less permanent roadworks that is. I drive on Tesla Autopilot when I can which has a maximum speed of 150 kph and only once in the 600 km from Venlo to Flensburg did I notice someone get too close behind me even though many were travelling considerably faster.

It's a different story further south around Munich for instance.

I agree though that road safety in Europe has a lot to do with road design, vehicle standards, maintenance, driver education, etc.