For me, I can't use three monitors. It just takes too much brain-cycles to process and remember "where that window is".

I can process two fine: one "the workspace" the other "the reference/product/outcome/tests".

I tried really hard to teach myself structure, but with three monitors, I find myself always loosing windows, losing the cursor etc. Hacks like "find my cursor" (not default on Linux) help, but I'd rather have a clean mental map of where my cursor, focus and windows are, at all times.

What stuck best was having the third monitor hold the API/documentation/reference but still, the mental power to keep all my whereabouts mapped in my head were just too much.

Also note that I went from one to three monitors, so this is not "just too used to two monitors to ever change" it was the other way around.

Ubuntu has nice tiling features without requiring tiling for everything ([meta]-[→] and [meta]-[←]) that allow my now-ingrained use of two monitors on my laptop-screen when I'm somewhere without a second monitor. Another thing that I disliked about my three-monitor-setup: it does not map in any way to a single monitor: using virtual desktops worked, somewhat but still too different.