I've talked about this before elsewhere. My yard isn't one you just wander into accidentally. A kid would have to very deliberately climb up a hill covered in scratchy juniper and then cross my front yard. Or they would have to go up my very long driveway, up my steps and around my screened in front porch to the side, in front of my living room window.
My pond won't be deep, but I know it only takes a small amount to drown in. I'm going to have steps on all sides but one.
If I find that it seems to be luring people up and onto my private property that close to my house, I can easily do a decorative fence between the corner of the porch and the stone wall that runs along the back of the pond site.
I'm home all day as well, so I think all those factors together make it at least a little less likely that someone would wander by and fall in. I'm more worried about the deer that cruise around at night, eating my plants. I think one of them would be more likely to fall in than a person! (And boy oh boy, I hope that doesn't happen! Flying hooves and deer panic would be scary!)