Maz summed it up quite nicely so I feel no need to regurgitate that information and add my own point of view. Why do any of you still continue to actively post here? Or are you more of a lurker/casual poster?
Something like what Rhode said.
I also miss the old days when it was busier here, but don't really dwell on it. There's a group of people here I've grown accustomed to discussing things with, and that's fine with me. Also, to what Maz said, there's a lot that doesn't get discussed anymore simply because there's not a reason to. I mean we can point people to EJ, or debate which is better RAWR or Mr. Robot, but there's not a population here that theory-crafts anymore. I mean, I don't know about the rest but I don't have the kind of time I used to. So theory-crafting for me is less about spreadsheets, and more about what's the most effective way to farm gold while balancing a baby on my lap.
I wander over to other WoW forums as well, but there's not much I that motivates me to post much. A lot of the discussions happening we've had so many times here people won't participate in them, or won't take them seriously anymore. Some of that's a little bit of maturity I'd like to think. We're not all in a tizzy when there's no shaman in a Ensidia boss kill pic; FtoM classes come and go and such, and most here have seen more than their fair share. We've heard the "WoW is dying!" threads, people's new ideas for expansions, speculated about lore, etc. I'm not in beta, and I'm happy to save the surprise for when the expansion is released I guess, so that's not a big deal to me.
Ye olde casual gamer got olde I guess. Mostly content to toss the occasional idea around with the gang that's still here, reminisce about the old days a little, and yell at the youngins who won't git off mah lawn!