Once you get flying the other two reps quests aren't bad at all. Flying makes the content of WoD about 1000% more enjoyable. Ground mounts probably wouldn't have been so bad if they didn't purposely design all the areas to trick you into going up dead ends or blocking you from getting past every 5 feet. It feels like the zone designers were trying to frustrate people on purpose.
The fel corrupted apexis quest goes from being one of the worst quests in the game to try to complete everyday to being a 5 minute breeze.
But yes you're right, the way Blizzard throttles a players ability to progress their character in certain time frames through shitty daily quests is infuriating.