Let's say I go to the supermarket. I buy some milk priced at 2.34 €; at the cash I'm expected to either give 2.34 € (not 2.30 €) or give 2.35 € and wait for the 1 cent change. If I say I don't want the change it's usually considered very strange, almost "rude" (sort of a "I'm rich" attitude).
But this really doesn't seem to make sense. Having to deal with 1 or 2 euro cent coins adds roughly 5-10 seconds to each translation we make (for each person involved), and an unskilled uneducated low pay €10 per hour worker earns almost 3 cents every 10 seconds.
Just having the 1 and 2 cent coins in your wallet increases time spent for transactions since it makes other coins (especially the 5 cent coins) more difficult to find.
So why were they created? Was this problem not anticipated or not considered serious? Why do people use them? Being "precise" about this seems to matter enormously to people besides me; some are willing to wait even 10 minutes if the coins ran out to get their single cent.