I have about 15 Emacs years behind me and picked up Vim about a year ago. Currently I am more or less equally efficient in both (as far as editing is concerned) and love both. Now the lisp hacking experience in Emacs is something extraordinary; everything just meshes together. What language (including its community etc.) would relate to Vim as lisps relate to Emacs?
While vimscript is indeed the primary extension language for vim recent versions support Ruby, Perl and Python extensions as well.
To answer the actual question - vim is immensely popular with Perl, Python, PHP and Ruby developers. I know quite of lot of those and next to none are using Emacs for various reasons. This is, of course, reflected in the supported extension languages I noted earlier.
Lisp is not Emacs's only stronghold IMHO - it has fantastic C/C++, Haskell, Perl, JavaScript, Scala, XML, etc. Ruby's own creator is using Emacs for both C and Ruby hacking. I personally use Emacs for everything :-)
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