That's how I learned to make it in Poland and that's how I drink it myself.
Me too, if I'm not at home using the machine, and even then, sometimes. It's properly brewed that way, and if milk or cream is added, always seems to make even the cheapest coffee taste luxurious.
Coffee here is certainly not a 'posh' thing at all, especially made like that. You'll find 'parzona' coffee being made on every building site.
Even in the PRL years coffee was widely available
This is true. Mostly I think imported from Brazil. Poland has a few big coffee roasting plants that were open right through the PRL years. The one in Poznań is huge.