Whilst I do not condone bad customer service have you ever thought they may be pissed off with being blamed for all the points you yourself are complaining about?
Queues at checkin - staff numbers cut to the bone (if you are short staffed you get on with it , no minimum levels like crew have)
Queue at security - Staff employed by another company
Queue at currency exchg - Staff employed by another company
Queues to get on/off aircraft - because no-one listens and just want to be first on and off
Queue at border control - Staff employed by Government
Queue for baggage - it can take a while to get bags from aircraft depending on stand and other a/c pushing back stopping you reaching the baggage hall
Queue for taxis - What can I say it's another company.
Unfortunately queues are a part of airport/aviation life these days.
One of the reasons you are called to gate early is to try and get everyone in place for when boarding commences, even a small delay can have a huge knock-on effect to the operation and cost a lot of money.