Wow. I went over to basically the exact same countries last year - just add Liechtenstein to the list for my trip.
You're right. "Youngtimers" as the Germans/Swiss would call our cars, are not very common on the roads in these areas of Europe. My gf's father in Switzerland is a big Mercedes fan, and owns two: 1960 190SL, and an early 80's 280SE (w126). But aside from those two cars, I can't really say I saw a whole lot of other older Mercs...
I thoroughly enjoyed my time in Europe, and I hope to make another trip out there again next year.
Edit: threads are useless w/o pics:
His 280SE
And his 1960 190SL
