I used to use B&W film sometimes when I had my manual camera, I really love the effect. Couldn't afford it too often though.  I find myself looking for different things in the scene that will work in B&W but for some reason I find it harder to get into my B&W mindset when I am using digital. Possibly because it can get complex if you make it so, whereas with my manual film camera it was just intuitive and simple.