By the sound of your prior post, I'll assume you haven't spent much time in Northrend yet, but you have to have at least spent plenty of time in Outland.
The novelty of how huge the game world is stops being a novelty and starts becoming a hindrance once you get to Outland, especially for Horde. When I was in Outland, if I wanted to do something in Azeroth, I had to go to Shat, port back and then either pay some Mage like ten gold to port me back to Shattrath or spend ten to twenty minutes getting back. That's ten to twenty minutes I'm spending running/flying and riding and waiting for zeppelins that I could be spending actually enjoying the game (Game being the operative word, not a chore). For Horde, this often meant flying all the way back to Shat from Netherstorm or Shadowmoon (Which is like six or seven minutes on its own) then porting to a Horde city to fly to wherever it is I had to be, then back to Orgrimmar or Undercity and from there (Depending on which) either flying ten minutes from Undercity to the dark portal or waiting a few minutes for the zeppelin and then riding said zeppelin before even being able to do that much.
And it's not much better in Northrend. If I'm down in Azeroth, I have to travel to Undercity or Orgrimmar and then travel all the way back to Borean Tundra or Howling Fjord, which then resulted in a ten minute or so flight to wherever I had to be.
Bear in mind, I could use a bank alt to do my auctioneering and such, but the grind from 58 to 80 becomes a huge pain in the ass due to having to travel back to Azeroth to train because there are no class trainers in Outland or Northrend. I've had points where I wasn't sure if it would take more time to just wait out my hearth or actively travel. The hearth cooldown is something that should've been done when the Burning Crusade first dropped. It's either this or add an AH and a full array of class trainers to Shattrath and Dalaran (And that still doesn't account for levels 68 through 74, where you can access Northrend but can't get to Dalaran without a mage).
I've heard people say it's an "easy" matter to manage your hearth cooldown, but it's really not. Not when you're questing in Sholozar Basin or Grizzly Hills, where you have to travel a pain in the ass distance to get back to Dalaran to port or travel a slightly less pain in the ass distance to Borean Tundra or Howling Fjord only to have to catch a boat or zeppelin back to Azeroth.