I never really used IDE like IntelliJ or RubyMine. But I always feel they are too bloated. Maybe just different use case.
Sure it takes a little longer to start up than a no-plugin Emacs or Sublime Text, but it also does a lot more and I don't have to fiddle with it to make it work.
Also, consider that ST2 is in its infancy and how developed its language support already is (see SublimeClang, for example). As ST2 becomes more popular, it might compete with the most developed IDEs.
Wash & repeat ad infinitum.
So I'm much more worried about developer fatigue than bloat in my editor choice.