My dear wife is still mostly at the eye-rolling stage.
At least she let's me sit facing the door. I would say that is about the extent of it.
Well I take that back. After a few years on the road in the RV we at least pay attention to what's happening walking into and out of WalMart.
Awkwardly, I can't say my SA is laser-keen; I had a guy get the drop of me within 6 feet at a WalMart in SE San Antonio. He was on crutches. Geez. :/
But still. I do try and keep my head on a swivel and am generally aware of those within my line of sight and/or movement. I've discussed the concept of "unexpected movement towards you is one of the key pre-assault indicators" with her so there have been times where "something odd" happens. Mostly we deal with it by avoidance or walking faster/changing direction.
Knock on wood I've not even had to put my hand on my carry gun, ever.