I don't find myself healthier. I eat the same and I'm a little more active; but, not much. Not enough to make a real difference. Increased physical activity on one day is not better than spreading it out over a week.
I don't get more sleep. Numerous studies say to keep the same sleep schedule every day and one day is not going to make a difference,
I'm not less of a jerk. Having Friday off does not do anything to my energy levels on Monday - Thursday. I try to sleep and eat right all week.
I don't think am better at my job. While there is some less stress because I have an additional day not to think about it; I am also not around for anything that might come up on a Friday.