Many thanks for assuring, HG.
In fact, I had similar thoughts as MrsJ about those schools until I visit them; Boys seemed too serious and pressured from tradition. My view was no more than tourists' mind, i.e. outsiders, with some hearsays. Talking to house masters and seeing boy's living area and classes, gave me real feeling of the schools that even my close friends or parents could not understand with words. As some say, those schools have not very good open days and only open for those who will send their DS to them. I liked the Toy system with near 1:1 tutoring in WinCol and also liked private room for both privacy and responsibility (no dedicated prep time) in Eton. After all, boys are boys - some are tidy and well organised, and others are messy with smelly socks everywhere.
Both offered even wider optional extracurricular activities than any other schools that I know of, and boys were so busy catching up as many opportunities as possible with their free will. To me, busy-ness is good, especially for adolescent boys, in terms of exploring many and find their interests before joining the real world.
I'm sure other well-known schools would offer the similar, if not the same. The point I want to make is that those schools are not just about tradition and seriousness.