Grey's Anatomy is OK. DD decided she wanted to be a medic after watching House.
I woud really recommend some experience of the grottier side of medicine. DD worked in a care home: "waitressing", ie helping people with their food; kitchen porter and cleaning. The manager suggested that it would provide her with an essential insight into whether she was cut out for medicine. Some people are comfortable about working with the elderly, others not.
DD had a gap year, including chalet hosting for a family ski company. Again a real insight into the family dynamic. I think that in the light of her experiences so far she would be happy working in a specialisation with a lot of elderly patients, but might want to avoid paediatrics.
Her gap year helped. Her course (Bristol) has a real vocational feel, and medics are different from other students. For example they only started their first year exams after others had finished theirs, and it was back early to do a three week placement before the start of term. Post gap year, this suits her. She likes the mix of practical and academic. Sadly one of the patients she had got to know, died during one of her shifts. Equally one of the junior doctors took the time to introduce her to a patient with something very rare, which she might never see again in her career.
Bristol offer the option of intercalation, and as well some interesting options within the University, allow students to spend a year elsewhere. (This is not true everywhere.) My understanding is that, as well as providing background for a specialisation, quite a lot of students like to break up their training with a year as a proper student.