Yes you are certainly right there, AKL
is very busy at peak times!
I came back from SYD
on a QF
743 a few months ago and it seemed to take ages to clear customs/immigration like almost an hour and the only other flight within about 30mins was a LA
343 that arrived about 20 mins earlier.
Plans are definatly underway to expand though, 2 more hardstands recently opened and alot of Earthworks to the Western side of the International terminal are underway now. I agree though this work is probably about 2 years behind what it should have been though.
Recent airline movements at AKL
Emirates 3x daily 773, 345
Asiana 4x weekly 772
Royal Brunei 4x weekly 763
United left unfortunatly, hope to see them back sometime in the future though.
added quite a few extra flights mainly to LAX
Several other carriers added extra flights over the summer period aswell, AR
will add more flights later in the year (Winter) aswell and more than likely other carriers will aswell next summer.