And if we wrapped children in bubble wrap and put helmets on them they would never get hurt. I don't think your mother's level of vigilance is bad, I think it is unnecessary for many children, mine included.
No, kids would surely pop the bubblewrap before you got them out the door. ;-)
But seriously, it's only unnecessary if you have complete control over all situations, including the strangers that might come up to your children when your not looking or the things they'll wait to grab at till your back is turned.