I got the 49" version of the dell Alienware display (basically this one size down with different branding and stand)... . From my perspective you're looking at it incorrectly, the point isn't to be able to look at everything at the same time, it's to be able to quickly glance from the one side to another.

Let's say I have an ide open, I will likely not look at the directory structure often, but I want an easy way to switch files - fantastic for having it available just by glancing over

Now you run tests, start the application etc. It also doesn't need to be in your view, all the time - but isn't it convenient to be able to just look where you know it's?

It's suboptimal for competitive gaming however, exactly for the reason you said. Scenic gaming on the other hand is improved by it, because the larger screen is more innersive