I block third-party cookies, and as a result I never see a Disqus comment. I've found that if I don't allow Disqus to set a cookie their JavaScript widget just spins ineffectively.
I wonder if the new Disqus will stop requiring me to send them a tracking cookie in order to read the comments. (I accept the need to identify myself if and when I want to post. But it would be nice to be able to visit a web site with Disqus installed without that visit going into my permanent record next to my name.)