Did flying mounts ruin Azeroth?

The question of whether flying mounts may have ruined Azeroth is a hard question for me to even posit, because I love flying mounts. I love being able to fly right over things that annoy me, drop right in on quest objectives and soar right out again. I loved that we could finally fly in Azeroth when Cataclysm shipped, and I was absolutely in favor of being able to use my flying mount to skip over stuff I disliked when questing and leveling up.

But it's worth considering: Did that convenience that I so love come at too high a cost? Did being able to fly over obstacles keep me from appreciating how much detail went into the zones? Did it ruin world exploration, something that a lot of players got a lot of enjoyment out of for a great deal of vanilla WoW's run? Did incorporating flying mounts into Azeroth, in addition to forcing a complete redesign of the world, also end up stripping out interesting and cool places you had to really work at to find and visit? Let's discuss the pros and cons.