Yes, for the technologically literate echo chamber of HN and most of our immediate peers, GPG may seem trivial to install. But the real people that have something important that needs to be encrypted (journalists, entire countries full of suppressed people, business secrets, etc) will NOT think this is trivial and most people will simply take their chances.
That doesn't mean that GPG is bad or that it isn't a strong tool, it means that for mass adoption then we need to make the tools easier to use.