I have to say, out of the grand total of 4 times I've boarded at ATH -

2 flights to LHR: massive scrum at the gate with people pushing around a statusless pax who is stuck at the front blocking the gate but unable to move back - agents were checking BPs carefully and only let *G / business through

to SKG and LCA: there were more or less 2 huddles of people (not going to call it a queue) and the *G / J huddle boarded first.