My GPG or How to look like a real nerd
I started to use GnuPG and it looks pretty cool, although its user experience is just awful. The complexity is high enough to make you do mistakes without even realizing it. On the other hand, modern encryption protocols and systems like Signal are much more user-friendly.
But PGP systems get really useful for signatures, for instance for signing Git commits.
Edit 2016-02-07: new key pair and Keybase profile.