I think I spent nearly five years GPG-Free. When I was with the FSFE, I know I spent some time fiddling with the smartcard variant, even. But then I spent a long time working in places where secure communications meant talking in the hallways and secure electronic commuications wasn't relevant at all. In those five years, only Ingo once sent me an encrypted message; I've now finally replied to it.
Because yes, I've gone back and unearthed my GPG keys from old backups, and once more can use FEA2A3FE for communications, just like I did in 2002.
Quite possibly Moxie Marlinspike is right, but for non-casual communications this can still be useful.