I carry a small icescraper in my work bag... how else do you get into your ice encased car when your only scraper is held hostage in your trunk? Oh I usually have two snow/ice brushes in the trunk, my buddies earn their free rides home!
I still dunno how effective it is to flip your wipers off the windshield when parked for long periods (esp. in freezing rain)... isn't a windshield defroster enough?
And most importantly, even if you don't have to, pee before you get in the car... a 10 minute trip can easily turn into a 45 minute bladder torture!