I don't know anything about holistic medicine, sorry. One example of holism for me is understanding the meaning of words by looking at their relationship with social practice.
I also like to look at the influence of ethics on epistemology and the reverse. I just want to emphasize that the individual living human doesn't have the time to become a specialist in everything and must sew a world-view and ethic together somehow. I like to look not just at another human's words but at their bodies (health, age, beauty) and lifestyles/biographies (where word meets action.) I love the biographies of philosophers.
Looking at things in context -- that's "holism" for me.