I've been travelling (sadly not by bike) for the last month or so through France, and now into Germany. I've paid cash a couple of times for things in supermarkets (by choice: I wanted change); otherwise, everything's been contactless: fuel, tolls, supermarkets, bakeries, campsites...
I'm travelling in a camper van, and using aires de campingcars, or, as they're known in Germay, wohnmobilestellplatzes. Often they're free, sometimes they cost a couple of Euros. Sometimes it's free to park but you have to pay for water or electrickery, or the use of the dump station (If you need any of those things; usually I don't). Sometimes you have to put a couple of euro coins in a machine, sometimes the machine takes contactless cards. (And sometimes you have to buy a jeton in a local shop, and all the shops are closed for a holiday weekend, but that's another story...)
(Contactless suits me because it always takes me a couple of weeks to get the hang of euro coins, so every time I pay cash, rather than fooling about going through my purse examining each coin carefully to see its value, making me feel a fool and eliciting groans from the till queue, I tend to hand over a note. And then at the end of a few weeks, I've got a bulging purse full of coins I can't change anywhere, and which I always forget to take with me next time I go. And then I can't even get a trolley at a supermarket!)