Yes, English is by all means the language of science. Less than one per cent of all scientific publications worldwide are today written in German. Despite this, there are still many good reasons to learn German.
Freiburg is an important centre for academia and has a number of top notch research institutes to its name, as well as an ancient and internationally respected university which excels both in the sciences and humanities.
Konstanz is home to one of the most prestigious universities in Germany, making it an obvious destination for many academics.