gvim has folding and projects? That's the first I've heard

How much have you really investigated VIM? I've used it daily for over two years, and I'm still finding new things. Folding is something I've known existed for some time now, but only in the past few months started using -- but it's been in there for years.

If you're interested in managing projects in VIM, the excellent project plugin has been a staple of my VIM setup practically from the time I started using it.