On that note, I'm kinda surprised people haven't freaked out more about the latest contactless cards. We have a history of being very reluctant to use the technology due to security fears, after all.
I don't mind because I have a wallet that blocks the NFC signals. I remember testing it when I got my first credit card with an NFC chip; I rubbed my wallet all over the terminal and nothing happened. Then I took the card out and it worked right away.
Most wallets have RF blocking to stop NFC now; it'll usually say it on the documentation that comes with the wallet. If you keep your cards in such a wallet you can relax.