I don't like straight displays, things at the corners are a different size than things in the middle, because they are further from my head. On curved displays, objects on different areas of the screen are the same size as they originally appeared.
Are you sitting really close or have a really enormous monitor? Measuring how I'm sitting right now, my nose is exactly 61cm from the center-center of my monitor, and ~72cm between my nose and any of the corners, and it's a 32" monitor.
I'm usually sensitive to things not being 100% straight/level/aligned, and if I create five identically sized windows and put them in the middle and one in each corner, I see no difference between them.
Flat ultrawides are an especially miserable experience, where the sides of the monitor are viewed at a 60 degree angle, a pronounced deviation from the 90 degree angle in the middle.
This is only true if your eyes are in the focus point (center of the circle) and you never move your head or chair.
It's especially glaring when the far plane serves as the place where the view-distance limiting fog is rendered: if there is some thing barely visible before you, turn 45% to the side, and you'll see that thing very clearly at the side of your view.