Make an editor which will randomly color-code each set of parentheses such that they or their background is in a set of colors which don't appear as other keywords (like function defs or strings or whatever) so as not to add confusion. You now have a way of more easily seeing every matching pair of parens without having to hover over each one. However, now you have to deal with a strange assortment of colors on your screen.

Oh wait, you can just use a gradient of colors instead of random ones, with the more-nested paren pairs having colors farther in on the gradient. Silly me.