No use doing a survey here; 99% of UK pilots don't read this stuff.
I've seen loads of illegal VFR flight in France and Spain. It's also commonly done in ultralight types, which is why so many of them are IFR equipped these days.
It's equally true that much of Europe outside the UK doesn't fly much - hence my comment about dealing with a problem by legislating it out of existence.
It's true the UK has a nice mix of Class G with (practically) no service in it which facilitates this kind of flying (legal or not) but France has Class E to FL105 or so and it's a free for all for "VFR". However I think VFR in IMC in France is done mostly at low level, not in the Class E "airway" routes; just as well since they contain IFR traffic.