At work we were using VIM for all editing, except PHP.  Back when the decision was made to use PHP for all web development, consultants told us we needed an IDE that offered all kinds of tools that VIM lacks.  So we shopped around for IDE's and eventually bought Zend Studio licenses for everyone.  Today those licesnses are collecting dust.  Even with the feature rich toolset of Zend Studio, and other IDE's, none seem to satisfy our need like VIM does.