Why not use Lastpass? It stores everything encrypted, and it's free for both OS.
It's because I'm already using Lockwise for that purpose, and I have things like SSH keys and other sensitive info that aren't exactly a username and password, so I need to dump those in an encrypted text file that I can quickly decrypt when I want to edit them. I don't fancy spelling out gpg -e -u KEY because I can't type that quickly without getting the command wrong.
I might end up using the gpg from Cygwin to avoid having to put a Windows gpg program in my %PATH% and diagnosing for the next 3 hours why the command is not found.