I think it's an easy thing to get used to, especially if the parentheses are a bit thicker. They're just a more slender character than a curly brace, so they do

I think it's an easy thing to get used to, especially if the parentheses are a bit thicker. They're just a more slender character than a curly brace, so they don't appear to take up as much space as the others even in a monospaced font.