I live and work in Paris so maybe i can help you?
It all depends on the area, really !
If you wander around FSH or Saint Germain of course you will spot many Birkins from well-off Parisians.
If you go to the 18th/19th 'arrondissement', chances are you will see none.
It's easier to spot (silver) Hermès jewelry or leather bracelets on Parisians are they are way more affordable. I think the most popular bag for Parisians is the Evelyne (=not the most expensive)
At work i can tell it's the number one brand for men's ties.
Hermès is even more popular in the south west of France (Biarritz for instance) because many wealthy French people have secondary homes there.
I have never seen a Parisian with a bright-colored Hermès bag ; they tend to carry discreet colours and under-the radar items
I totally agree with you for the Parisian degree of affection toward Hermès, i feel that way myself