For the longest time, I really felt outnumbered (and somewhat harassed) as a 3E fan, to the point where I largely gave up on ENWorld - I think Edena's recent poll helped me (and, judging by the threads popping up, a lot of other 3E folks) realize that we're actually still a majority here, despite how vocal a lot of the 4E proponents have been.
Or perhaps it's just a manifestation of a larger trend I can't see since, as I said, I've stopped reading ENWorld for a while.
On the management side... I have to say that, given the fact people running ENWorld have a financial stake in the success of 4E (I distinctly recall Morrus complaining about how badly they were doing on 3E merchandise after the announcement of 4E) I think it'd be hard for some kind of bias - or something that might as well be a bias, in terms of how it looks to us posters - to creep in. Though I don't really think it extended to matters like modertion policy, even if some of the heavy-handed measures taken to prevent "edition wars" (I marveled at things that were construed as inappropriate, during that period) could at times make it seem like it.
For example, the way early Pathfinder threads got moved out of General RPG Discussion and into one of the sub-forums definitely felt like they were being swept under the rug...