I've always found that EnWorld members are some of the most well mannered board users on the Internet. I've been a lurker for the most part, with exception to the last month.
I can't say that I'm intimidated by an individuals post count. I'm sure many of those posts are "I agree", "me too" and the sort. If anything is intimidating, it's the shear brilliance of so many of the people on these boards.
The only elitist attitudes I have seen have been when novels are being discussed. I am amazed at how many people feel the need to bash others for their likes and dislikes. Salvatore and Greenwood may not be on my preferred reading list, but I'm not going to slam someone because they like Elminster and Drizz't.