How odd! There have been extraordinary queues every Thursday evening for the last three weeks when I've arrived at T2. I'm talking dozens if not hundreds of people waiting at the eGates.
I'd have taken a photo if I was allowed to as I was quite shocked at the queues.
To try and visualise the queues, they extended to beyond the corner where you turn right to enter the lane for the eGates. The lane then snakes before you can queue in front of an eGate.