Garrisons killed interactions, I love the combination of Dalaran where both factions go and class order halls, where people of your class from both factions go. It's a huge improvement on garrisons, order halls building on the system already in place.
Flying didn't really have anything to do with it.
But as I said, so far this zone design doesn't seem lazy at all, so I'd love it if pathfinder flying was available right now. Exalted with all reps, loremaster, all treasure achievements, exploration, etc.
Zone design has been far too lazy the last few expansions.
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If anything, flight helps you avoid being bothered by others. Somewhat anti social.