That's fine. I've been in the trenches of this argument for long enough to know that my points often fall on deaf ears. But there's always a chance my points will get across one day, or that someone else reading will see what I'm saying. It's all good.
The entire point of these forums is to discuss the game, even if we often disagree with each other.
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Actually, I didn't do the content involving the ground assault on ICC until after I already had flying(I did Stormpeaks first). My first encounter with the Icecrown zone was flying in to land on the airship and conduct missions from there. It was followed up by tactical strike missions for the Ebon Blade, and assaults against the Scarlet Crusade mini-island off the coast. It was just as epic, and I enjoyed the hell out of it.
The entire zone of Stormpeaks used verticality and made flying feel very needed to get around. Being able to fly from plateau to cliffs, and into caves felt(to me at least) to be a very enjoyable experience where I could explore the tops of mountains and invade enemy strongholds that would otherwise be inaccessible. I guess they could have done the same thing with flight paths, but it would have felt a LOT more constrained and more on-rails.