I do actually, and I should reword that to "not useful for serious programming." VIM to me is best used for lightweight, quick and short editing tasks. THats how I use it. For any involved work, you're going to want a debugger, you're going to want automated build tools, you're going to want effortless compile/run cycles and so on..
You don't really want to implement all of that in VIM because your work won't be portable.