I don't like programming with proportional fonts as much because they tend to be narrower than monospaced fonts. To get the same on-screen indentation, I end up

I don't like programming with proportional fonts as much because they tend to be narrower than monospaced fonts. To get the same on-screen indentation, I end up using more spaces, and it's easier to have an off-by-one different in indentation, which is troublesome if I'm using Python, and which really bothers me if I'm using C++. Aside from that, I like having nicely-aligned tables in my code, and it's sometimes useful to align conditional statements across lines. Monospaced fonts just fit into my workflow a little bit better.