You actually used it? It was a clever hack, but it was always just a bit too much hassle. If I wanted to share something with someone (via mobile or otherwise), I found SMS/email/IM was faster, easier, and understood by everyone. And no extra apps to fumble with!
You never have to type anything with bump, and you get the entire contact info, image and everything. No way does SMS or typing out an email do the same thing. Even typing in bump into the app store and starting it for the first time to send a contact is less work than writing an email. Touch app store, touch search "bu.." there it is, install, share address, touch phones boom done. It probably takes about as many touches just to get into the email composer.
On my Nexus 5, if I'm on the right screen, it takes 1 tap (Gmail widget). But I agree that bump is way more convenient for sending this type of data and is well worth the effort.
chirp is a clever hack too and fun...
I'd suggest BitTorrent Sync - it has a file send mode which works with QR codes.