Much less "content" since you fly over most of what you want to skip. When I'm at max level in WoD and I want to go somewhere, I will use flight taxis to skip large amounts of "content". That said, the penalty of no flying at max level will push me into Garrison to use official Blizzard garrisons bots to play the game for me and queue for content. For me, no flying at max level is a poor way to gate content.