I have the same setup as you - vanilla vim, barely customized and the development pace is hardly any slower than when I use Visual Studio with all its auto-completion, deep syntax parsing, etc. I saw Jonathan Blow (of Braid) saying that auto-completion and better debugging support is a deal-breaks for him, but everyone`s work pattern is different and I`ve seen plenty of cases where people using vim accomplished far more and faster than those with fancy editors. Tools are important, but they are secondary.