I think the girls love Twilight so much that it has become a part of their daily lives. I feel the same way, now when I discuss Twilight and things related, it is more matter-of-fact than fangirl squeals because Twilight feels natural. It is still exciting and I love it, but it has been a part of my daily life for so long that the enthusiasm can sometimes be hard to tell.
I love Sammi, Anna, Nicole and Rachel and think they do a great job bringing us a podcast weekly.