It's not a conscious train of thought, perhaps one that goes "I have poor balance and motor skills, therefore am more likely to fall, therefore I should exercise more caution than most people in situations where I could fall off something and hurt myself".
It's an entirely instinctive thing, or unconscious, or whatever it is it's outside my control.
Enter James May, and the discussion of proprioception and vestibular sense that starts at 3:20 in this video:
I don't know whether I'm more reliant on vision than others to regulate my balance. But since neither proprioception nor vestibular sense really pull their weight with me, it stands to reason I might be. And while I'm very aware of the everyday shenanigans these underperforming senses cause - the bumping into things, the over- and under-reaching because my arm's not where I thought it was, the having to take some time every morning when I first wake up to work out where my legs are - I hadn't thought about it extending to things like this.
The more you know.
Image: base from the Powerhouse Museum via Flickr Commons, inset Lunch Atop a Skyscraper.