Because I spent the vast majority of the time I spent on code reading it, and the layout matters to me in terms of how much time it takes for me to read code.

Yes, I can get used to other layouts, but that by no means means all layouts are equal to me in terms of how readable they are, and how well things stand out when they should, or blend in when they should.

I recognise this isn't the case for everyone - some people read code beginning to end and it doesn't matter how its laid out. But I pattern match visually, and read fragments based on layout, and I remember code based on visual patterns.

Ironically, because I have aphantasia, and don't visualise things with my "minds eye", but I still remember things by visual appearance and spatial cues better than by text.

That's interesting. I also have aphantasia and I seem to be the only one around where I work that cares one bit about visual presentation. I suspect it's because people with aphantasia have to rely on waiting for visual recognition to happen so often that we get good at it and rely on it more. I'm also known for figuring out a problem and jumping to the exact file and area in the code that's causing it immediately where others apparently have to read through the code again to find it. I just remember it's maybe 2/3 the way through the file and just past that big switch statement and has a one-liner comment above it and has a distinctive shape.

For me, indenting with tabs and aligning with spaces helps me find the code that I'm looking for as does adequate whitespace and a color syntax highlighting editor. Aligning things with distinct columns where it makes sense helps a lot, too.