I was thinking more about stop-and-go traffic, as opposed to moving slowly but at a steady pace. I'd expect the repeated accelerations to consume more than just going at a constant speed. Is that not the case?

Not terrible unless you are lead footing both the accelerator and brake.

Also as far as Stop and go... its typically also lower speed; wind resistance is not linear based on speed, so 'crawling' is not that bad.

Im in the US and drive a hybrid rather than an EV, that said 'stop and go' is when I will often seem an MPG -increase-, so long as I gently accelerate (in severe stop and go, just letting my foot off brake and not touching gas).

That's also some of the justification for 'mild hybrids' that have an auto stop and maybe at best a 11kW/120Nm electric motor to kick things off. If you don't drive with a lead foot they can improve efficiency (but overcomplicate things compared to Toyota HSD)

I suppose main counter condition would be in low temperature conditions; AC is fairly efficient, Heating less so, and then in severe cases the batteries need to activate their own self heaters.

You get a lot back (70% or so) from the regenerative braking.