@tptacek is spot on actually: "The emerging consensus among experts is that it's not worth the trouble, or, worse, incapable of doing much more than generating a false sense of security."

I don't know what the consensus among experts is because I'm definitely not one of them. However, the Podesta email scandal/hack/case take-away for me was that... if the most expensive, modern digitally-aware campaign ever made did not bother to use GnuPG for emails, it means that it is pretty much a dead-in-the-water tech.