I like the 4 day week, but that is because I have kids who are teenagers. Giving them some extra time each night with their parents is not important to them. But having an extra day to do something big, explore a new place, go to new museums, take small road trips, go camping, etc. - that makes a difference in their life.

When they get older and go off on their own, though, I would agree with you - a short daily working routine sounds good for me personally.