The ASL's are as much or more useful to motorbikes and they cause little obstruction to bicycles. As a motorcyclists and cyclist i use them on both forms of transport routinely. Ideally they should be marked for all two wheels traffic, so that they have a safe area after filtering through a queue....encroachments into ASL by drivers and especially by motorbikes - blatant removal of my right of way just because I don't matter etc etc.
Starting from inbetween two car's front wings just isnt an option. I will intentionally cross the stop line even if there's no ASL to avoid that. The law is one thing, but i put my own safety first.