People pay with rounded bills most of the time, cashiers are fast at returning change (amounts are usually a single cent below the full euro for each item, so change isn't a big problem).
The credit card workflow requires you to sign as well (or alternatively sometimes your pin if it's a debit card). Also, no swiping, only chip readers.
So in essence, taking out the bills is comparable to taking out your card, and the question is whether signing/entering pin is faster than the cashier giving you your change.
Of course occasionally you will pay in exact change, but that's balanced out by all the times you have to insert your card a second time, followed by trying another card.