This is a statement that comes up a lot and I don't think it is particularly true. While a site with a very particularly anti-4E vibe to it, like Paizo's boards, is certainly going to give you skewed results, I think it is a little odd, given the diversity of opinion and general quality of discussion here at EN World, to presume that our opinions are somehow wildly different than those of the general gaming public. EN World, I think, is especially representative of D&D fandom, n ot least because even though it started as and largely remains a 3E site, we have a lot of posters that are admitted older-edition players/fans.
For all the bluster brought out about how EN World polls don't mean anything (unless the poll shows that people hate Vancian magic, then its all good) I can't think of a more representative community. it may not be scientific, but that is hardly the same as being meaningless.