I'm kind of embarrased right now, our dining table is lucky if it gets used for dining once a year. It typically gets used as the place I dump stuff when I walk in the door, and as a resting place for (the large number of) things I haven't gotten around to putting away. But I don't think you're being overcautious, I was reading a study that came out recently about lead and brain function, and the new findings suggest that the current EPA "safe" levels are actually far too high. So I think anything we can do to reduce exposure is a good idea.