Interestingly, and the opposite side of the coin, when Barclaycard foisted a contactless card onto me a couple of years ago, because I hardly used the credit card (rather use my bank's debit card), I phoned up my bank to see if they could give me a contactless debit card. When told they didn't do them yet, I found my usage of the contactless credit card going up - when faced with paying for something small, I'd look at my wallet and see two cards; one which you just tap on the till and you're on your way, and the other which you slide it in, wait a second, try to remember the PIN on that card, enter it, find one of the keys doesn't work properly, re-enter it, wait a second, then you're through.
Given I often have to mash the card against the reader to make it recognise it, I think the fears about thieves being able to "nick £10 from my by just walking past" are typical tin-foil luddite views with no basis in fact.
Sure, if someone nicks your wallet, you're more exposed to small (sub-£20) losses, but I've found I can't make more than one or two contactless purchases in a short space of time before it refuses and prompts to do it the old way (PIN), and anyway, your bank is still liable for the loss if you've taken "reasonable precautions" (ie. don't leave your wallet on your dashboard) and let them know as soon as you know it's gone.