You're missing the point of the educational areas - they're not there to necessarily be 'popular' or bring in more guests, they're there to be used for the park's educational programs, which won't (I seriously hope) end any time soon. They are very popular with local schools etc.
And with kids. My 8 year old has been to Disneyland, DCA, Knott's Berry Farm, Legoland California, Universal Studios California, San Diego Zoo, Sea World San Diego, Mk, Epcot, DHS, DAK, Sea World Orlando, Legoland Windsor, Chessington, Drayton Manor, Alton Towers, Legoland Discovery Centre Manchester, Blackpool Pleasure Beach, Port Aventura, DLP & WDSP (20 odd times), Parc Asterix, Europa Park, Phantasialand, and Efteling. His fav? Legoland Windsor. And his favorite attraction there is the Lego Mindstorms workshop, every time. There is an audience. Just as we would never go to Thorpe Park as it is not for us, there are many who do not get Legoland either.