I don't. If my window ain't clear, then I can't go anywhere.
(NOTE: This does not apply to torrential downpours, tropical storms, and other severe and heavy weather).
I use a Rainx windshield wash that's pretty handy. It means that in most cases my wipers only need to be on low or timed settings and everything is perfectly visible. You never want to be the guy that has it set on high for just a little bit of rain. What ticks me off is when you see people who don't turn on their headlights when it's raining. If your windshield wipers are on your headlights, according to the law (US), should be on. I have yet to see a State that didn't have inclement weather as a criteria for when you must have your headlights on.
(NOTE: This does not apply to torrential downpours, tropical storms, and other severe and heavy weather).