This is the first forum I've ever been part of, and even though I have wasted an inexcusable amount of time here, It has also provided much needed stimulation for me at work especially...but I basically agree with you.
It's real easy to spend too much time here, or on forums in general, and that isn't really what PD is about, it's meant to be helping you become more productive, moving towards what you want in your life...how can that happen if everyones is wasting hours of their life in front of a computer? Finding a healthy balance is preferable, and I think I've worked out when to log out if I feel I'm just waiting and flicking channels, like with the t.v control.
Real life interactions are a more tangible and real exchange of energy, even though people can type out their thoughts and attempt to get them across easier here, and hopefully someone understands it so that you don't have to waste even more time repeating yourself.
I realize this place is also somewhat of a place where people can snag potential clients for their businesses, so I'm sure that is a stealthy motive to spend so much time here