They always (well, mostly) used to enforce priority boarding at ATH but on my last four flights it has been the same: They make the regular announcement that Golds, Business class etc. will board first and then completely ignore that and just allow a scrum without enforcing anything. At the upstairs (jetbridge) gates I think there is usually a "separate queue" (a sign at one sides indicates C class and gold) but they still ignore this. Downstairs at the bus gates it's just the scrum... Why do they even bother to make the announcement I wonder.

TBH I have given up trying as it doesn't really matter I suppose. I was actually going to email and complain but would that really do any good? Maybe if many of us complain at the same time?

At outstations (NOT domestic!) things are much more orderly and the pririty boarding has always been enforced so far as I can remember (my recent flights were from LHR, BEG ARN, BHX)