Where can you use euro cents?

So, I'm curious to know - where exactly can you use euro cents in your daily life? Are they widely accepted at supermarkets, cafes, and other retail establishments? Or are there certain limitations to where they can be spent? I'm also wondering if there are any places where they might not be accepted at all, and if so, what are those places? Additionally, do you find that euro cents are a convenient form of payment, or do they sometimes cause frustration due to their small denominations and potential for accumulation in pockets and wallets?