I have four 4K screens, and it is heaven. I got spoiled early in my career by a Unix system that had a greyscale newspaper layout monitor in the early 90's. That monitor could crispy display an unfolded two page newspaper layout with space on the left and right for tool/editing interfaces. For a while, 4K monitors were landing right near US $300, so I got 4 over a period of months. Simply being able to array references around my work, with space to spare for communication and music interfaces. It is lovely to hit stride and before I know it the day is over, and a ton of work accomplished.

Do you recall the name of that monitor from the 90s? Sounds interesting

It was a Sony News Workstation, with an IBM branded grey scale monitor displaying 16 grey levels at 150 pixels an inch. Total display was about 1900x3600, a bit larger than an opened two-page newspaper spread. It was a CRT monitor, requiring two feet behind the screen for the back of the monitor and quite thick cabling. It was a Unix workstation, used to author R&D CD ROMs, back when the CD ROM itself was R&D.

Just in case you didn’t know, you can rotate any monitor 90 degrees and get the same layout.

Which ones?

Here's a 27" 4K at $300: https://www.amazon.com/dp/B07PGL2WVS

I have the slightly better version of this. The only major difference is the stand AFAIK - but if you have multiple monitors you might as well get a good VESA mount to arrange them while keeping your desk clear.