They are possibly my favorite tool in my writing toolbox. They allow for asides, tangents and other quirks to be worked into writing so smoothly. Without parenthesis, I don't think my writing would have nearly as much personality. (Just look at my past posts.)
This is not the first time I've declared my love for this punctuation. Here's an excerpt from my work blog bio:
When I'm not doing the social media thing, I enjoy hanging out with my husband and puppy, reading (especially Texas Monthly), going out to eat, volunteering and using parenthesis.