I have had mixed results. For my corporate inbox it's not as useful (except to identify sales goons who are cold calling and to see who in my company has profiles on which social sites -- which can be very entertaining indeed!). For my personal inbox it works better but is less entertaining since I typically know everyone I'm corresponding with and already follow the twitterers, etc.
What I'd like to see is some enhancement in the area of CRMness similar to what http://noteleaf.com/ provides, notably the tasks/alerts feature.
To answer your question, though, yes, I am going to turn it back on. :)