Borovets is a cash only resort, I am guessing the same goes for Bansko and Pamps, there is however easy access to ATMs and money changing places, just walk down the 'main street' and you will see money changing places and there is ATMs in- and outside the Rila as well as in the Flora, and I assume other places, but these are the ones I have always used.
It's not a cash only resort many restaurants do have card machines. However most restaurants prefer the cash option..
Mark IOW is out in borovets now so his weather updates are not as often. However he has said he will update when possible and only if there is any weather changes
Have to say, i've never seen any restaurant or bar taking payment by c/c. in Borovets other than hotels with restaurants. Plenty of ATM's to use and i've never had any issues with chip and pin. Although you do have to be sensible like you do in the UK, don't let them walk off with your card etc. Common sense really.
I get a good exchange rate too from the HSBC when withdrawing cash.