I've known a few, including one who was a music journalist, who interviewed Jordan Rudess in 2014.
I got my mom and my girlfriend into them too. But you know, only to the extent where they enjoy listening to them, not the extent where they can talk about what songs are on which album, or specific parts or anything.
The only other DT fans that I've had as friends, I met either at a DT concert, or on Facebook, as a result of making DT related posts.
But still, I'd call that 3+.