I have a BSME, and I find it influences my habits in weird ways that the average rider probably wouldn't think about. For instance:
-I've retired an otherwise good looking aluminum handlebar because I had used it for years. I thought I must have put it through enough cyclical loading that one of these days it would catastrophically fail on me.
-I was given an old road bike with an aluminum fork, which had been ridden for many years by its previous owner. I examined it and couldn't find any stress cracks, but all the same, I couldn't trust it.
-I can't bring myself to buy a carbon fiber part because I'm not good enough to not crash. If it got dinged, I'll be too worried the crack will propagate under cyclical loading.
-I'm fascinated by a bike out there called the Slingshot. It has a cable in place of a downtube. As far as I can make out, it would be fine in tension as you sit on the bike, but the minute you catch some air, that cable will simply go slack and what....the bike folds on itself? I imagine the bike also has rubbish lateral stiffness.