Absolutely so
Nowadays I fly mostly IFR when I go abroad, because it's so much easier to plan, but when I used to fly VFR I used to file e.g. UK to Croatia, one leg, FL075, and when I turned up at KONAN at FL075 (cough cough FL074 really, probably) and got handed to Brussels Radar (or whatever) and gave them the next few waypoints, they just let me fly straight through the whole country - just like IFR traffic. OK, transiting Belgium takes only about 3 minutes
but I got the same over Germany, etc.
VMC on top the whole way...
The impression I got is that ATC just love traffic like that. It really does work.
I am sure it helps in the UK too but it is less obvious because the Class D system is a lot more "stuck up", and ATC generally is much less joined-up.