I qualified 30 years ago but there are many downsides. Life as a junior doctor is exhausting, things have changed since I was a junior doc, more shift patterns, no on call from Fri am until Mon pm but you still are expected to work long hours and make huge numbers of important life saving decisions early on in your career when you feel poorly equipped to do so.
You do have people moaning at you and expecting you to sort their lives out, even the nonmedical aspects of their lives like housing, relationships etc (I'm a GP).
When I entered medicine I thought I wanted to work with people, after 30 years of working with people I think they're over rated. I'd probably go into physics or engineering now, but alot of people fancy a change of career and get fed up of their jobs
Yes you are well paid, but when you look at the ability of people choosing to do medicine we are motivated intelligent people who would have ended up in well paid jobs if we hadn't become doctors. We earn far less than company directors/ city boys etc but with our organisational and risk management skills could probably have succeeded at those careers if we wished.
On the plus side you have a huge range of medical careers to choose from, although I think the current medical career structure tries to make people specialise too early. You can also work all over the UK, and I did a year in New Zealand, had friends who worked for VSO and others who worked on cruise ships.
The job is rewarding, but no matter how good a doctor you are you will make mistakes sometimes and get complaints, although the 2 aren't necessarily connected and most of my complaints are related to me not giving a patient exactly what they wanted eg valium, opiates, never ending sick leave, or just about not being able to keep people alive forever.
Most of medicine isn't saving lives. It's dealing with chronic disease and reconciling people to the fact that their bodies are aging and failing. Drugs and surgery can help this but we're still all going to die.
Once you are in a medical career as a consultant or GP your opportunities for travel are much reduced, but then the same is true of most permanent jobs. You do your travelling before you get your career post and then just go on holidays.
You'll probably find that when you get older and have kids you're not that bothered about travelling all over the place anyway and get bored of endless superficial conversations with strangers and different varieties of biting insects. If you want to keep travelling you could work for VSO or MSF or work in a ski resort or cruise ship.