Over 90 percent of my purchases in the UK are by Apple Pay. Many of the rest are contactless card, and a very few require the actual chip and pin. I carry a few Pounds in my wallet just in case but very rarely take them out - or even my wallet for that matter. John Lewis department store, like many places, has a very high limit on Apple Pay. I've in the past couple of years used Apple Pay in a John Lewis to buy a very large TV, laptops, iPads, and a new iPhone and new Android - just a tap of phone and wander down to Customer Collections.
Buying fuel for the car if I go inside some supermarkets limit the Apple Pay to less than £30 so it is insert the card with them, others it is just a swipe of the fone. Pay At The Pump is always insert the chip & pin.
My experience is that a high number of places wherever I have been in France recently are contactless is quite common, and Apple Pay is accepted most places that contactless is. I haven't run up against a contactless limit there but most purchases I make in France are fairly small, and it is always chip & PIN at the fuel pumps. I haven't paid in the shop for fuel for several years.
I don't remember ever having an opportunity to use contactless in Netherlands or Belgium.
I am continually surprised by how few places of any size or sort in Germany accept contactless and I don't think I have ever been able to use Apple Pay. I'll be back there in a couple of weeks so I'll see if it has changed. I always keep plenty of cash handy in Germany - I find it easier than cards except at Media Markt (I'm astonished that they not only don't take contactless but I've never spoken to anybody in one who had heard of contactless), hotels, and biergartens. Interestingly I don't use cash on German transportation. Every verkehrsverbund (regional transportation authority) and DB and private rail companies all have excellent apps which after linking a card issue pretty much anything you need for transportation on your phone, either a QR code or within the app. No cash needed, and no ticket machines either.
Luxembourg is half and half, not much Apple Pay - although knowing them I am sure it is just around the corner if not already there - but plenty of contactless.
Italy likes cash, but I've never had any problems with cards for larger purchases. I wouldn't take my phone out in Venice to try to top up my resident travel pass (it has never taken up swimming and I don't want it to start) and I can't remember if I inserted the chip & PIN in the ticket machine or tapped it. Sorry I'm not more help there. I've always used cash in Rome.
Have I left anywhere out?