Oxford's MSc IHTM is an intense year with so much contact hours and after-class work. Expect to also go beyond the 8-week Oxford terms. They do make sure you get the most out of your experience. Yes, the leadership and communication components of the course require a lot of commitment and offer a lot of opportunities for growth. Overall, the course gives you the breadth of knowledge and skills that you may need if you intend to lead and participate in global health work.
Since the course is quite small compared to other international health/trop med/public health courses (in LSHTM for instance), you also get the chance to know your cohort and the academics in the class. Traveling during the placement is also exciting, so it will be good to choose a project outside your comfort zone. I have an acquaintance who applied to IHTM but ended up going to LSHTM and found that the classes were a bit too big for them, but I have limited knowledge on that front.
If you want to know more, it's great to reach out to people (Linkedin, social media). I know many IHTM alumni who are keen to help.