Maybe in frontenddev/small companies/small largely static websites FTP pervades, but I'd argue that most developers that deal with any real complexity probably

Maybe in frontenddev/small companies/small largely static websites FTP pervades, but I'd argue that most developers that deal with any real complexity probably use some kind of source control system to 'share' files rather than some kind of FTP program. And I'd be very surprised if relative FTP usage hadn't decreased significantly over the last 3-4 years (But this is all quite anecdotal, and I could be wrong). Something that does surprise me is that Panic's Coda and Transmit apps still seem quite successful, so maybe my perception is out of whack.