Credit cards etc are near field so shouldn’t be a problem unless you go right up and tap within cm or two, plus the protocols have stuff for collision detection, so can distinguish the cards. Still though it’s often a dance at the turnstile to try to get it to register. You shouldn’t actually need to wave yourself at them at all, just pass through but many of the readers or cards are flakey.
North America varies a lot and some resorts have them, some use bar codes, some still just the sticky thing and lifty inspecting it. The rfid stuff can also vary on the side. Some work both, some only one side and can vary which between resorts. A few insist they must also be visible despite rfid, so on a lanyard or clear pass holder pocket thing. And week or season passes might require a photo.