To be honest, joining the Euro has never really troubled me. Not for any economic reasons, more that if a country
really doesn't want to join that is obligated to do so, they just deliberately fail to meet the joining criteria. There are 4-5 criteria that must be met over a certain number of consecutive quarters. Czechia, Poland and Hungary are three countries that definitely do that and I wouldn't be surprised if Romania, Bulgaria, Denmark and Sweden are the same. Oh sure, there's pressure from the ECB but if you don't meet the criteria then... "Oh noes! We can't join the Euro.
What are the chances?!"
Slovakia has four EU land borders and three of them, the three I mentioned above, use a non-Euro currency. It's very easy for me to travel to Budapest or Prag but a bit of a pain to have to change money each time I go there. At least Austria is on the Euro too otherwise that really would be a pain; I'm in and out of there a lot and go to Vienna several times a year.
And if you
do want to see the Queen on the Euro then get yourself one of these 2002 prototype sets like me: