As AnTyx said I would drive through the Harz ¨mountains¨ and then on your way you could stop and see the Göltzschtalbrücke and the german-german border museum near Mödlareuth, if you should find them interesting. Also if you have time their are some nice things to see in the Harz. I also transit Germany on most trips but I always try to find some interesting places to make a nice route and to see something on the way to destination.
As mentioned before don´t skip the Sächsische Schweiz (Bastei) south-east of Dresden.
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