It depends what you're doing. If you need a couple of documents open side-by-side, such as something you're working on and something you're referring to swapping workspaces doesn't cut it.
Well okay, "better than nothing" functionality, then. :D But y'know, thinking back to early in my career when development (er, such as it was for a junior programmer with bad habits) consisted of an 80x24 green screen using ed on a Unix with no job control. Then one day I managed to get a second terminal. Wow!