Exactly. You can only focus your attention on a limited area regardless of number of screens. A head-turn is a worse interface for switching information than a shortcut key.
Everyone works differently. I use several monitors at work and definitely have to turn my head a few degrees to focus on my secondary. I use an ultrawide at home.
I'm way more productive with more display area than a single display using virtual workspaces and shortcut keys.
Similarly I do better with multiple monitors and infrequent app/workspace switching than I do with one monitor switching apps/workspaces constantly.
In fact one of the reasons my gaming PC doesn’t often do double duty as a Linux workstation is because it only has a single monitor and no matter how I configure shortcuts for switching apps and workspaces, I always find myself irritated to the point of distraction trying to get work done. All my real work happens on my dual monitor Mac setup.
