Yes, the site I link to is The Straight Dope, which along with Snopes.com is a brilliant source of debunking urban myths - some of which, however, are so stupid that it's hard to imagine anyone believing them; this being a case in point.

Wikipedia tells me that the wider glasses are more suitable for sweet and heavy champagne than for the dry champagne more popular these days. I've certainly seen both types of glass used, though the tall thin flutes are pretty much universal round here.