I've got a 1080p monitor and a 4k TV in my house and have used my computer plugged into each. The TV is also better for a lot of non-resolution reasons so sometimes I'll want to move it there for those factors but in terms of displaying the 4k visuals, I honestly don't think it makes a difference for me at all. Rendering the image at 4k internally has all sorts of benefits for the graphics but displaying that internally 4k image on the 1080 monitor retains all those benefits so I don't see any point in buying a higher-definition monitor.
But the thing is, I never even wanted 4k on the TV at all. I didn't want it to be smart, either. I just wanted good-looking colors and it became impossible to find a TV that put the effort into what I cared about that didn't come with the other features. So I suspect that when I do ever replace my monitor, it's probably also going to strong-arm me into having a higher resolution that I don't actually want. And I can't help but assume this is a big portion of what's leading to these survey results.
(Edit: An image should be shown here, but it's missing...)