This whole "ex-WoW players do this" and "ex-WoW players do that" gets really old.
Just don't. No one knew all of us, no one ever played with all of us, no one has ever even spoken to all of us. Not Yoshi, not Ion, and certainly not some random human on forums. So please, pretty please, with sprinkles on top, stop making sweeping statements about what "ex-WoW players" are doing. Some humans do this crap IRL too, labeling groups of people as "wanting this or that" or "behaving like this or that." Lunacy. That's not how science, logic and common sense works.
On topic: the Aether Current system is fun, easy, and super simple. If you want to rank "ways of getting flying in popular MMOs," then I'd say doing Aether Currents ranks easier than even paying a few thousand gold, which is the way WoW used to do it before Pathfinder became a thing. Earning that few thousand gold took easily twenty times longer than gathering Aether Currents. I mean this literally. Gathering, say, five zones of Aether Currents from absolute zero might take you an hour. Earning 5k gold in WoW, back in the day, for a first time player leveling up, might take ten, twenty hours or more.
AC for an entire zone takes 15 minutes. You have a compass for pete's sake. And I want to emphasize that the 15 minutes would be the net time spent if you went into a zone for the sole purpose of gathering the currents and doing nothing else.
If you do something like the following - you know, logical, common-sense type stuff - then gathering AC takes no more than five minutes of your time, per zone, outside of things you are normally doing:
Press the aether compass while on the way to each quest task and it will tell you if one is nearby. Pickup all blue quests that you see and do them when the main story takes you near to their objective. Once you finish the story events in that area, you will then be able to fly.