The only advantage to torrents over newsgroups is the selection of older movies/files. Now that most newsgroup providers offer 200+ days of retention (ngroups.net is moving to 400 days and I'm sure all them will eventually) for under $15/month unlimited its a pretty good option. And easy.
I have been using giganews w/ newzbin for ages..
Hmm, that might have been part of your problem, unless you were doing raw usenet searches too. Newzbin is a collection of submissions by users and moderators, so you're searching through user provided data, not everything on usenet.