I used to be one that would recognize frequent posters. I was a non-member lurker as a pre-med.
Here's the ironic thing though. SDN kind of pushes people to make their pre-med journey into a ridiculously well-calculated path, even though it's disguised as being "passionate." Such need for careful calculation undoubtedly leads to neuroticism. It's no surprise that people therefore are so scared to admit they are on this site. They feel anything and everything can be used against them at some point. I know I felt this way.
I think SDN is one of the only places where you'll see threads asking things most people wouldn't think about, like threads about sending a thank you note after interviewing. It's crazy that it actually leads to a huge discussion.
I'm shocked there are no threads yet asking whether it's okay two go number two when you're interviewing because there's a chance an ADCOM might end up sitting in a stall next to you. This would then result in a massive discussion as to whether pooping will have any impact on your chances.
When you have things like this going on, it's no surprise that people distance themselves from this site.