It is a rare sight that you even cross someone going at 200 km/h. First there are continuous construction works on the roads. Then you need to remember the constant traffic jams just about everywhere.
The picture on that article is from the autobahn in Frankfurt with direction to Darmstadt. It is one of the few places with 4 lanes where you can speed at your hearts content for about 10 kilometers and then slow down. This if you are lucky that slow drivers go the right-most lanes, often that doesn't even happen so you have to slow down again.
The only exception are fridays when driving to East Germany and Poland. On those roads you can speed and the large majority of them are just trying to get earlier home and enjoy more time with family.
Quite frankly, the most dangerous road in Western Europe have got to be French highways. In those you get young kids doing all kind of dangerous moves and speeding right behind you without respect. German drivers are noticeably more mature, you drive fast but with experience without thrills.