I also will strictly use 80 character lines. I like that because it means I can have two vertical panes of code open at the same time even on my 12-inch MacBook

I also will strictly use 80 character lines. I like that because it means I can have two vertical panes of code open at the same time even on my 12-inch MacBook (regular/not pro), which I love b/c of it's battery life and weight.