I essentially used bangs extensively many years ago (not through DDG; I set up custom keyword searches in Firefox), and I agree that it worked quite well. I now use raw Google searches, and I think Google is now good enough that it is not worth using bangs anymore (Google privacy issues notwithstanding).
Fair enough. :) As I said in my original post, if DDG's privacy is not a selling point for someone, then I agree with you; bangs are hardly a reason to stick with DDG.