I took the time to learn Dvorak (years ago), and I found it very much nicer for typing prose. However, I couldn't code with it (and I didn't try a code-focused version). Perhaps I should have tried different Dvorak variations to find one that was still better than QWERTY for writing while also being usable for coding.
I also tried a chorded keyboard (the BAT). With only a little practice I got to 60+ WPM (which isn't bad considering it's a one hand keyboard)... but it was just too laborious to code with since modifier keys and symbols took so much extra effort.
I'm still waiting for a neural interface... although if you give me a neural typing interface, then I'll want a neural visual interface so I'm not limited by monitors.
As an aside, why why why do people use the international keyboard layout? There is no possible way that it is more efficient given that two of the most used keys - left shift and (right) return are reduced in size and pushed further out of reach from home position. Worse yet, their lost space is taken by less frequently used keys. I cannot fathom why that design has remained popular outside the US.