I know, I have been thinking the same ... quite a lot of us here now! But on 5 cruises so far, I have only ever met/seen/heard 2 German speaking families on board. A Swiss-American family on last years WPBC, and a German family on one of our cruises out of New York City. One of the German guys was even Platinum (and no, it wasn't dizneeat's brother

). We have yet to cruise with German-speaking Disers, that would really be fun!
We did meet some German speaking DISers on our cruises. It was fun to hear some German. And we even met some Austrian crew members - Bettina, and Andreas, the hotel director! Going back to back to back helped a lot. 
Last summer we met a German family on their second cruise and ran into each other ever so often during the one week on the Fantasy.
On our last cruise there were two Swiss families on their first cruise. Really sweet.
EDIT: Oh and by the way ... five readers? Who am I missing? Karin, mimmi, dolphingirl47, me and ...? Your sister probably?
Absolutely the same here! "What cruise line? Never heard of them. Seriously, Mickey Mouse? Okaaayyy ... I always knew you were weird".
And to think that Aida and MSC and several other cruise lines depart on Northern European itineraries right from my hometown ... I will get around to trying them eventually. But so far, we have never strayed from
DCL