I was in Germany a few months ago. The change from when we lived there 30 years ago is noticable. It seems even the smallest town has it's "Turkish" community. They are everywhere. And a lot of things and places seem much more "run down".
Turks everywhere? You must have been in the west. In the eastern parts of Germany the bigger towns will have a FEW Turks (enough to run the Doner Kapab shops...) but that's it. Even in Dresden (a million or so people) I did not see one mosque, and I'm not sure these Turks have Islam as much more than a tradition to them... It's definitely not a potential "Eurabia" at least in the east.
A major difference between eastern and western are the numbers of immigrants. The economy is so bad in eastern Germany even the Turks don't want to live there.