Streamline,
I see you're from Belgium - I can only comment on the UK situation, but there are several large airports here that take traffic inbound from Class G airspace (uncontrolled). Often the a/c would require a huge re-route to remain inside controlled airspace. At the moment they take a direct track under a RIS or RAS - isn't this what pilots want, to save lots of miles? (comments welcome from pilots)
Also, to any high-speed pilots out there, check if your approach takes you into Class E airspace. Technically it's controlled airspace but VFR doesn't require a clearance to enter, nor are they under any obligation to contact the relevant ATC unit, hence it's Mk1 eyeball time. This often involves military fast metal, and having recently seen a pair of fast moving, non-transponding jets suddenly appear in the region of an airliner I was controlling, believe me, slower is better!!!! And no squawk means no TCAS either.....