How many languages does your IDE support? How long will it take to implement a decent support for your new DSL with maximum a dozen of users in your IDE of choice?

After answering these questions you'd understand why Emacs (or vim to a lesser extend) are superior.

"My question: Is the time invested in vim worth it? My answer: no, unless you are bound to a console in a way or another. "

Well, a lot of people are bound to a console.