Not that I'm constantly trying to wedge myself into spaces the width of my head, of course. But I do consistently hit wall corners and doorframes with my shoulders. Filing cabinets with my elbows. Desk corners with my hips. It's a good thing that I don't run around at top speed all the time, or I'd be covered in bruises.
I don't know if it's (solely) a result of me not paying enough attention to the world around me, or if my truly awful ability to judge distances is coming into play. Honestly, I just spent a full minute trying to guess how far it is from my desk to the wall. I had to get up and use my armspan to determine that it was about 3 feet closer than my best guess.
Actually, I guess I need more than just whiskers. I need some sonar too. Cat powers plus bat powers. And I'll hold on to my current hat powers. You can keep the rat powers and gnat powers, though. Don't want to be too greedy.