Roberto Orci and Damon Lindelof are dyed-in-the-wool Trekkies.
Difference being they were on a team that included people who'd never experienced Trek, or very little, so it provided for a good balance between the two points of view.
Another big difference is that Orci and Lindelof have the professional skills, judgment and experience
doing this kind of work not to let their fandom push them off-kilter.
Saying that they are Trekkies in response to Elton's point that fans shouldn't be participating in making the movie is somewhat akin to responding to someone who doesn't think the average football fan should be an NFL coach by pointing out that John Madden is a football fan, too.