It's still so secretive because they have to maintain the cover-up on the "Jack the Ripper" slayings. Who else spells Jews as "Jewes"?
My dad, his dad, etc., were all Masons and Shriners too. I got a lot of pressure from them to join also, but no way was I gonna join their little "secret societies". Actually caused some family friction for several years ...
BTW, either A&E or The History Channel occasionally runs a show which supposedly exposes the secrets of Masonry. Pretty interesting, but nothing major was revealed, although they did reinact the initiation ceremonies.