Do most people not have banks that just silently do currency conversion for you? I go overseas and use my US-based credit card all the time without any issues at all. The conversion fees are pennies per tx.
Next time you should check the conversion rate your bank applies versus the one Google shows you and you will see that while your bank seems to be charging pennies only it probably charges 2-3% of the full transaction sum on top of that via the conversion rate.
Chase Sapphire offers $0 forex fees, Visa has a live forex calculator. USD to EUR has a .41 percent fee from Visa. So 41 cents on $100. I can live with that.