Vim or Emacs are really powerful tools that will serve you well over your entire career, so getting adept at them will pay dividends. It's similar to learning how to touch-type, or typing with a faster WPM, in that it's not a pre-requisite to becoming a good and productive developer but it certainly helps.
Emacs is my personal favorite editor, and I've found that the more adept I get at using it, the easier it is for me to get into "flow" and be productive. I don't use my brain's CPU cycles to fumble around trying to manipulate text as much, since through repetition and muscle memory I can work at it effortlessly (compare that to someone who has to two-finger peck while programming).
Similar to other powerful tools though, becoming good takes practice and a time investment. But I would argue that the initial upfront investment will pay off in the long run.
TL;DR: Yes, absolutely. Learning Emacs (or Vim/SublimeText/Eclipse if that's your choice) well will definitely boost your productivity in the long run.