Dondare. I know IG's more than capable of fighting his own quarter with an intimate knowledge of the law up his sleeves
But in his defence - I must ask what you say is "stress" per your post.
For example - been to umpteen market days abroad. It was a crush and very intimidating to me in a throng of people in which my steps were determined by sheer two-legged volume. Not pleasant experiences. OI felt claustrophic/crushed/overwhelmed by a surge of people who "propelled me along the market" if you like. I can say I do not feel this same "fear" in Keswick or on other local market days.
However, I take my sons to football matches and feel this same surging volume mob threat to me and mine. It's not "anarchy" but a crowding surge threat if you like. I am trying to be honest as to "gut feeling" here
I must say that on the odd occasion whereby I weave/filter or jam... I feel "smug" when I weave past the standing traffic. I do know from my own experience of being a driver in a static jam that a stress level can rise.
Dondare in fairness to IG ) and I do admit to a family loyalty as I do know the bloke as my wife's cousin) - I think he just accepts why some get all lathered up in a queue.

If traffic is congested, heavy and thus slow moving, then I don't see it as a "threatening situation to me". I don't quite see what you are cycling after or trying to say here
I mean .. I find riding in slow queue very much safe. I do not feel upset if overtaken on fast rural.
I feel more insecure if driver hover behind when an overtake is perfectly safe - when I know/see the unwiser decision which does not result in a tragedy but a "near miss"

I'd rather them pass than risk them trying it on at a pinch point further on.
It does not at all make me "feel any more confident about the safety of me and mine to be honest "

if they hover up my backside for too long.
(Edited cos I rushed the post without reading or thinking as one of the kids was "leaping" on my lap at the time

)