I used to see a Metrobus on the Washington, DC, streets, with an advertisement from the German government and listing a lot of German words in common American use. My impression is that most of them made their way into use via Yiddish.
Something like a quarter of English words are Germanic in origin, but mostly not modern German. Many of the identifiably German words in English are more recent inventions (eg kindergarten) or yeah, Yiddish.
