It's no surprise that many people consider "I've Got a Secret" to be derivative of "What's My Line" - it was. Howard Merrill and Allan Sherman (later known for his work as a parody singer) modified the concept of "What's My Line" by having the panel guess the secret that a guest is keeping rather than their occupation, and having a celebrity guest at the end of the episode. They then offered the show to WML producers Mark Goodson and Bill Todman who made Sherman the new show's producer.
The show's hosts - Gary Moore and Steve Allen in the original CBS run - and panelists didn't take the game anywhere near as seriously as John Charles Daly and most of the panel on WML. On the other hand I don't find the secrets on "I've Got A Secret" as interesting as the occupations on "What's My Line". And I confess that I don't particularly like host Gary Moore, mainly (but not exclusively) because of his habit of flicking his cigarette ashes onto the studio floor.
One episode that is definitely worth looking for is from September 17, 1962. Moore welcomes a couple whose secret is that their son became an astronaut that day. During his interview Moore asks them about how they'd feel if their son was the first man to walk on the Moon. The couple were Stephen and Viola Armstrong, the parents of Neil Armstrong.
