No, there are no enthusiast organizations that receive complimentary admission to the parks. This includes many groups including the American Coaster Enthusiasts (ACE) and the Florida Coaster Club (FLCC).
Currently, the only benefits offered these groups at any of the Florida theme parks is a discounted Annual Pass Rate at Universal Orlando. This discount may be obtained by calling the passholder sales department directly (i.e. can't get it at the gate).