I'm Dutch (never flown to Hilversum

), so i'm not quite familiair with the overhead join.
So you fly overhead, look for traffic, then join. But a what altitude to you fly overhead? Aren't there a lot more pilot's flying overhead? "Yes, but you have to look out for them" people can argue.
But then why not make a 45 downwind entry or the like? I just don't see the point of the overhead join.
Somebody care to explain? Thanks!