Delays in Sydney this Morning

[Graham F]

Today, I arrived at the carpark near the old control tower for a morning's observation and immediately noticed long queues of planes waiting to take off from 34L. After a while it emerged that only propjets, B734's and some A320 were using 34R and then mainly for landings.
Was there a problem with 34R?
The delays were substantial as at one stage around 1030, there were 8 planes lined up to take off from 34L and another 3 waiting to cross 34L and join the queue.
Some planes would have been in the queue for at least 30'.
Reminded me of the old days before 34R was built!