Now, you guys are starting to talk about alternate ways, let me suggest the following. Zero walk. Fairly quick, and still cheaper than Airport Express.

Go down to the main entrance of Pacific Place on Queensway, and take any of the 96x buses. That includes any 930, 962 and 969 series from Citybus and any 960/1/8 series from KMB. [Not 905 as that's much slower.] No more than $22.7, and with 6+ routes, the wait should be under 5 minutes. Take about 15 minutes to get to the Western Harbour Crossing stop.

The nice thing, even with the extra cost, is that you can then catch A10/11/12 to airport from there for $33 and about 25 minutes. Because of the combined frequencies of both sets of buses, wait shouldn't be too long. No walk, no tour of Chek Lap Kok and still costing no more than 60% of the train, and most likely less.

Not saying the best way, but a possible alternative.