Are you me? Exact same! The problem with dual monitors is either you're sat in front of the gap, or you need to pivot. This way you get a 'normal' monitor and a portrait section to the side, much better.

I have a pretty odd grid setup myself for a 55" TV monitor. Best part is holding shift and being able to snap a window to multiple zones. Let's me have a grid with tons of smaller zones that are useful for various apps when I need tiny windows and large ones when I don't.

I use 12 columns so I can still do this 1/3 - 2/3 split, but other proportions as well. I tend to have a chat app on the left quarter, browser in the middle half, and a music app on the right quarter. Lots more freedom than only two zones!

I set up three zones and a huge highlight distance between them. I can drag a window between zones and it resizes to those two zones combined. This way I can have three 1:1:1 windows or two 2:1 or 1:2 windows with the same single layout!

I've found splitting up my ultrawide into 6x2 cells, then you can use Ctrl+Shift to select every cell your mouse enters additively. I've wanted something like this for linux for a long time but haven't found anything.