Motorsport hotel is in Nürburg itself, almost next to the BMW testcentre and the road to Pistenklause.
If you don't use the shuttle buses during peak moments in the race, you won't have much queues.
I stayed in the An der Nordschleife hotel a few years ago, an did almost everything with the shutlle buses back then (stops across the road). Couldn't be easier, and no problems with parking. Only stops that were really busy during the race were Breidscheid and Brunchenn (and the stop at the GP Strecke the first 2 hours after the start). On Friday and Saturday morning you shouldn't have any problems.