I've been curious in the past, trying to find a reason to use an IDE. For me, the loose coupling of tools that you get when working with Vim in a console is priceless.

My trick (not really a trick) for efficiency is some simple key bindings to navigate between windows in Screen.

And if I really need power I'll run tabs inside of individual Vim instances within each Screen window.

I really think IDE dependence is one of the things that can prevent agility within a team. As soon as you introduce a product into your stack that a person's IDE doesn't have deep integration with, or doesn't play nicely with, all that productivity that person gained by learning that IDE is all of a sudden gone.