I definitely think that work experience is a good idea - I thoroughly enjoyed mine! Like (I'm guessing) lots of applicants, I had virtually no idea of what actually happens on a hospital ward before doing work experience. I'd watched the TV shows like Junior Doctors and Holby City etc, and while I knew that they were TV shows and therefore are designed to entertain people and wouldn't be accurate at showing what really goes on (especially dramas like Holby!), I had nothing to compare them to, and therefore they were the only things I could base my opinion on.
Having gone on work experience, I don't enjoy shows like these nearly as much, as I can now see how inaccurate most of them are, but I would much prefer to work in an environment like the one I experienced in an actual hospital than those in medical dramas!! I now know so much more about a doctor's work, and how they have to work in a team with all the other healthcare professions, work long hours etc, and it's certainly reinforced my decision that medicine is what I want to do. Yes, it's superficial cos you're only there for a very limited time, have no actual responsibility etc, etc, but I think that a superficial experience is better than none at all!