My experience of "did I lock the door properly?" has been that it's a function of general anxiety levels. I still do it occasionally - but in the last six months or so, I've only actually been back to check the door upon leaving the house twice, and both of those were on foot, from within a hundred metres. For comparison, I spent the preceding three years in a maddening retail job with my S.O. mostly overseas care of visa woes.

I do get the urge to go back more often than that, but more careful reflection does usually reveal an impression of the door being locked properly which I've not yet discovered to be confabulation.

This is of course in your list of minor worries, but possibly it's useful to know.

(Hi. Friend of oneplusme and damerell. Nice to finally have something to say here.)