If anyone reads this and wants the Skydrive AKL Skycity pick up location, its on the other side, ie, opposite of the Skycity hotel checkin, directly behind the hotel, right under Auckland Skytower.
The curved car park out the front of the Skycity, is for car and taxi drop off, but at the back of the hotel, is a lot of bus bays, not only Skydrive, but also Kiwi Experience buses that cross the North Island.
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The Skydrive website, lists trips from the city on the first line, with times, and on the 2nd line, its from the airport to the city, and alternates so.
When I first saw the website, I couldn't see trips from the airport to the city.
If your trips are during the day, maybe get the bus to Puhinui, but evenings or nights, till last, Skydrive is the one to go for.
After that, its $$$ Supershuttle, or the Novotel/Pullman Auckland Airport, if you won lotto.