Sure, common sense prevails when it comes to allowing the body to repair itself.
Anyway, you have pretty much nailed it all down. I used to get very angry with myself if I didn't at least exercise once a day. Now I can go days without doing anything. I tend to jog about 20 kilometers every week now and do weights on 4 different days. But, I don't mind if I have a week of doing nothing due to an excessive amount of college-work.
James I do not think you are living in a fantasy world thinking that exercise/yoga can cure illnesses. Obviously, it cannot cure some physical, chronic, illneses but it helps other forms of injury. For the mind, I have witnessed the effects yoga and meditation has on improving the morale of a person.
It works