PIA is a bad example, even if one passenger is travelling the whole family still come to the airport anyway, Virgin and Travel City don't have the same problem and they use bigger a/c.
Also, SAS may not have had enough desks for 2 T7's, ie lack of staff. To blame the queueing problems on the airport because of PIA is a bit harse, although i do agree the Secuirty problem should have been sorted b4 this summer, not through it...