He's visible to the cars at the front of the queue, that is all that matters. if you queue up 4 cars back, the guys two forward and two back can't see you.
If for instance you're at a junction , move up to the front left, or the second lane, both cars near there can see you, they can give you a few seconds to get going and be across the junction before a row of cars comes past of which half of them won't know you're about to be alongside them.
A good driver will see a cyclist, realise they are highly vunerable and a couple seconds headstart will help them across safely.
Think of it like this, a guy in the second row stupidly didn't get in the left hand lane indicates left, acts like a jackass, and when he looks over his shoulder, he can see a gap between two cars.. there is actually a cyclist in that gap but he thinks its a gap and pulls into it the second its alongside him and then he smacks the cyclist.
HOnestly it should be basically law that if a cyclist is present they should go to the front and if present car drivers should give them a headstart.
