The "Chip & PIN" credit card issues are long and extensively discussed here. Now, there is a new small thing that might add a little extra hassle: automated vending terminals/machines that only accept contactless/NFC payment (NFC stands for near-field communication).
These are machines quickly gaining traction for things like paid washrooms at train stations, beverage vending machines, lockers and similarly automated transactions. You use them by bringing your card (or smartphone, if enabled) closer to the terminal, and the amount stated is deducted. There are of course limits, a threshold is often € 15 or so with a low daily limit of € 50 (you can lower that).
Hopefully, this time around banks in the US are not lagging the rest of the developed World on issuing cards (credit/debit) with such capabilities. At least, NFC smartphones are ubiquitous now (a new mid-range phone will be equipped with it).
On a related development, I've seen the first tourist-oriented shops that have big signs saying NO CASH, CARDS ONLY. It is part of a pilot project to reduce the circulation of physical cash in central areas of Amsterdam and the security measures/risk it entails.