Dark One
The Tainted Dogma
I agree that I really don't understand people who just stand there arms crossed doing nothing. That would take away a big part of the enjoyment of going to shows for me. However, I tend to stick with just headbanging furiously and air guitaring, which is great fun.
I'm usually the latter description in your quote as well, but do occasionally get into to old school pits (especially when I have friends feverishly doing it and the music is hitting me particularly hard).
That said, I can completely understand those that stand around with their arms folded if just wanting to absorb the performance and be mesmerized by the sound (and sometimes visuals) is their cup of tea. This would especially apply to acts that are all about the sound as opposed to energy in a live setting, but can apply to any other act as well. Live and let live.
In Japan (from what I recall reading), most audiences are a non-energetic & hushed bunch until the end of each song when they applause wildly if the act is appreciated. Obviously a cultural thing, but I generally hear metal acts that tour Japan raving about the appreciation they get from their audiences.
Jason