Could it be placebo effect/confirmation bias? I am not a car enthusiast but I recently bought a new one and test drove both german and asian models and I honestly couldn't tell them apart.
I drove a '99 VW until it got wrecked. I picked up a '99 Acura afterwards and immediately could feel the difference in clutch & gearbox. I now drive an '03 VW, my girlfriend an '04 Honda and I can still feel the same differences. She's mentioned it too and says she prefers the "solid" feel of my car compared to hers. I've driven VWs of every generation from MK3 to current (MK7), I've driven Chevy/Honda/Toyota/Hyundai manual transmission cars and nothing feels as tight as the VWs I've driven.
So I'm a pretty big fanboy, but I definitely feel and believe there's a difference that can be felt.
No idea if they are still that way but at least at the time a Jetta and a Corolla were not anywhere close to the same thing.