That's what I used to think. Then I started using Sublime text and it's project management features (together with Ctrl-P/Cmd-P) and realized what a huge productivity booster it was to me.

I know Vim has NerdTree and the equivalent Cmd-T plugin - I have tried them and they don't work out quite the same.

There are still lots of things I like about Vim that aren't there in Sublime but it's all about compromises. I still use Vim for editing single files but use Sublime for any project that requires multiple files to be opened and edited.