My wife and I are traveling to Greece in October and my research revealed this article from the English language news source Keep Talking Greece.
I usually wait until I reach my destination to get a few Euros from an ATM using my debit card. I have done this successfully throughout Europe (Italy, France, Belgium) where bank card use is already very high. The article indicates that "Greek banks adopt new technologies scrapping the withdrawal of cash from ATM with a bank card".
I am wondering if I should expect any difficulties getting cash from ATMs or if these changes are focused primarily on account holders in Greek banks. I would appreciate any insights from fellow travelers.