I wish they would do away with G0 now. It causes daft confusion and awkward standing around with those who genuinely need to board first for mobility reasons. It is however occasionally nice when there's a "I'm first class, will I be boarding first? Why are there children ahead of me? I'm first class, don't you know!" that one can be escorted past, but this aside, the entire thing is an unpredictable charade. Yes I'm in a grump today.