It has changed a lot over the last few years. In a typical supermarket in Berlin you will see that the majority of customers pays electronically, these days. Adoption rates may be lower among older people and in rural areas, though.
In Austria I only see cash being exchanged at the supermarket and when I see someone paying by card or, God forbid, phone or watch, it's most likely a foreigner form another country where cash payments are not popular rather than a local who went cashless.