(Might as well post since this has resurfaced.)
I tend to play SRB2 more for testing levels and such. I can definately say that the last time I played SRB2 for long periods of time was when I was trying to get a hold of Camo Man.
I got SRB2 around the end of summer last year, and I joined the forums on....... Well, just check my profile.
And I open Doom Builder almost every day, so that means I play SRB2 almost every day as well.