I don't think I need more Helm's Deep footage but I would appreciate more of the Faramir/Frodo scenes and M&P/Treebeard. Those seemed a bit choppy to me in the theatrical release.
Sounds like you'll get your wish. And as far as the extended Helm's Deep sequence goes, I thought the same about the climactic battle in FOTR. In the acual DVD, however, I found myself liking the new stuff. I also thought I'd HATE the extended scenes in Hobbiton, but those turned out to be my favorites.
Moral of the story? Peter Jackson hasn't let us down yet...I think he's earned the benefit of the doubt on this one, no?