[lcuff]

Sorry to take so long to answer. Good questions. 2 space indents, in (say) 30 line functions, get harder to discern the more indent levels. This problem is exacerbated by bad eyesight.

Bigger monitor with higher DPI does help, yep.

Horizontal scroll: I suppose it could help. The more immediate tradeoff tends to be that I use a terminal full width on a large monitor when needed, and tolerate the fact that I'd prefer to have space to have a web browser open on the same screen.

I'm a big fan of Sandy Metz, who advocates 5 line routines. In Python and Ruby, this is possible, and the indentation problems go away. In C, it's more of a challenge.