The results of this thread are disheartening. That said, the majority of technical people in my professional and social circles do not use any form of email encryption.

I think it comes down to a combination of how few people use it and how much more work is required. The only people I know who use it are exactly the ones you'd expect: those who do things like go to DEFCON every year.

That's not to say that my other friends aren't sometimes cautious with some of their data, they just go to the length of doing face-to-face sharing of physical media and not having intensely private/personal conversations over the phone. Basically they (we?) all just assume that there's no way to protect it once it's on the wire, so "why bother?".

I can't stress enough how important holding/going-to a CryptoParty (or similar) is.