Maybe it's a carry-over from lugging around a hunting rifle, but I'm not entirely comfortable with carrying a gun with a relatively light, short trigger--DA revolvers are, in my mind, okay--- in a condition where anything in the trigger guard can set it off. When hunting, I keep my finger along the stock of the rifle and off the trigger. However, I set the safety or keep the chamber empty, because sticks have an annoying habit of getting into trigger guards. With the Glock, keeping my finger off the trigger means that I wont fire it unintentionally, but there's a non-zero chance that something else might fire it.
Now, using a proper holster lowers the chance of getting something in the trigger guard down to something vanishingly small, but bad things happen. So, I just don't feel all warm and fuzzy about carrying a Glock. However, my concerns are sufficiently far-fetched (but as that windbreaker example shows, not completely unfounded) that I don't think y'all are a bunch of yahoos for carrying one.
So, the short answer to the original question is, yes, the lack of a safety has put me off buying a Glock. At least for now. I would like to buy one at some point, even if not to carry. However, there a bunch of other guns higher up the wish list than a pistol I'd shoot occasionally and leave in the safe.