Are there any protocols worth using nowadays besides HTTP, HTTPS, BitTorrent and IRC?
Is anything still happening with NNTP or Gopher? Is FTP used by anyone at all?
FTP gets used all the time for remote filesystem access. You'll probably never see it in action though if you don't have a job that necessitates it.
Gopher is having a sort of renaissance during the last few years, the new content being largely nerdy, neo-luddite blogs lamenting the state of the commercial websites. There is also a new protocol called Gemini, created by the same 'new gopher people'. NNTP and FTP go on with their slow deaths.
The only people who use Gopher are pedophiles and Shii.
Telnet is the best protocol.
The reason a lot of the older protocols are dying is simply because HTTP/HTTPS covers most use cases well enough that it's not worth bothering with anything else.
what about zeronet?