Thanks folks.
I know enough about bees to know they die after stinging, and they don't (or shouldn't) sting without good reason.
I grew up on an acre of established gardens in the country, with masses of flowers all year round, and there were always a lot of bees moving among the flowers. In 18 years, I got stung maybe twice.
We've only been at this place 6 months, and so far my wife, my 7yo and me have all been stung after stepping on bees that were wandering round on the grass (we pulled out stingers each time). There's no weeds in the lawn, we had it sprayed. 5yo and 7yo have both had bees fly into their hair and get tangled, 7yo was stung (I found the stinger in his head), thankfully 5yo wasn't due to quick action, but she was so traumatized she might as well have been.
My wife was sitting on a wall outside (the one in the video) when one landed on her face, she reflexively lifted her hand up and was immediately stung up inside her nose. I got the stinger out with a flashlight and long pointed tweezers. Thankfully all without the kids finding out.
My experience growing up in the country set a kind of benchmark for me for what I thought was "normal" bee numbers and behavior. I don't remember bees walking round on the ground. The bees also flew fairly lazily between the flowers. Here they're zooming round the yard like little jet planes, sometimes there are clouds of them. Based only on my own experience, it doesn't seem normal, and 6 stings in 6 months also doesn't seem normal. I don't know enough to understand this yet, but given this situation, I need to learn the reason, and then do something about it if I can.
Anyway I am grateful for what I have learned so far.
Regards
RL