By the nature of code rather than regular language, it's nicer to have it lined up correctly. Also, in code editing, sometimes you want to block select, block copy and block paste. In Visual Studio, you can do the block selection by using the ALT key while doing your mouse selection. It might be different in different editors, but I've always found that option in an editor very important in some cases, and it wouldn't work very well, unless you are using a mono-spaced font.