Just to relate my experience of using a Polish Hospital.
Previously, I had only to visit a GP, for prescription renewal which was very easy, but the GP was an ex-student of my girlfriends so it was not a valid test of the system for a visitor.
Today, Sunday, I needed to get a painful eye problem looked at.
My girlfriend soon found, on the internet the Eye hospital that was on standby. Maybe in English it would need a call to 999 (112), or help from a local.
We arrived at the hospital and thought the 20 people waiting could be a long queue, but it proved to be family groups, so in effect we were about 8-9 in the queue.
Into the surgery after 35 mins. Details of EHIC card entered into system by the assistant (that was a bit slow because she had forgotten her glasses
Seen by the Eye Doctor. I was checked over for any serious problems - fortunately diagnosis was only bad case of Conjunctivitis, for which prescription written on spot.
Total time 45 mins.
I was very impressed with the facilities and treatment - and on a Sunday, and all for free with EHIC card. Well done Poland! It is not all a one-way street for the POles.
Everybody in Poland pays for prescriptions. My eye-drops were 6 pounds ( don't know how much in UK)