I actually know a few people who do know the name of every turn/section on the Nordschleife as they drive there every month several times (if track is open). Why make a whole discussion out of it, it's possible wether you believe it or not. I guess you can easily draw out or imagine most of LFS' tracks no? Same thing...
I do the same thing in drifting in real life, look at the section of the track I have to drift. Look at the clipping points, line, etc... And sometimes do it in my mind and see where I can improve. For the first entry sometimes I take a reference point, but mostly it's on feeling.