I love the greens - keep them as they are.
BA don't realise that without the greens the way they are things will be worse - as RT takes longer, misunderstandings take time to clear up and unfamiliar people (including new BA pilots) get confused.
Great system - at both LHR and LGW (only places I have experienced it).
Also - BA are hardly interested in delays - just look at the corporate target in the BA news.
The lighting operators do a great job and the only times it has caused a hinderance, the delay has only been a few seconds. Not worth throwing toys out of the cot for.
Keep it, keep it, keep it.