It totally depends on what kind of programming you want to do.

  - If you want to make web applications, then probably not.
  - If you want to build web infrastructure, then probably.
  - If you want to make desktop games, then probably.
  - If you want to make mobile or console games, then yes.
  - If you program in higher-level languages and want to exercise your brain, then yes (do it for your "one new language a year").