I find these experiences really interesting, because in Germany all major ISPs have been doing IPv6 for years and years now.

I dont think any normal person thinks about IPv6 or IPv4 here.

Even in America, ISPs fall roughly in two buckets: no IPv6 support at all, or IPv6 is supported and Just Works, like your case.

The parent poster's case is unusual. Normal people here don't think about v6 either, and the majority of people have a v6 connection.