Very useful indeed. I used it to compute the similarity of patients with different diseases, e.g. if patient1 has 3 diseases and patient2 has 2 of those three,

Very useful indeed. I used it to compute the similarity of patients with different diseases, e.g. if patient1 has 3 diseases and patient2 has 2 of those three, they should be treated more similar than if patient1 has only 1 disease and patient2 has another one. Euclidean distance would assign the same value in both cases.