Spreadsheets also do things like right-alignment or decimal alignment and mono-spaced integers, not because it adds any meaning beyond the grid, but because if something is off by a few orders of magnitude from the others, it will stand out.

The same can apply to code, and for things like matrix multiplication, alignment can be nice and help with some common classes of error. Say a unit test using a symmetric matrix, you might be able to spot that you fudged something much easier if things are aligned.

I don't normally tediously align everything, but sometimes it makes sense. Especially when your editor can do it for you.