From the many trips I've done to Paris Disney...Magic Kingdom on its quietest day of the year, is not far off what Paris is at its busiest day of the year.We don't even have to speculate. We have a Magic Kingdom in Paris. I wouldn't say it's better run than its US counterparts, and people certainly aren't boycotting it.
When you visit Paris on a quiet day, pretty much every ride is a walk on - You can never ever say that about MK...they are 2 totally different parks when it comes to footfall.