I highly recommend actually staying in the 20-60 range zones until you ding 62. The reason for this is that despite getting a slight penalty in experience for being over-level, the advantage of having flight will more than offset this. That, and WOTLK and TBC zones are the slowest part of the leveling process. Minimizing your time there as much as possible is worthwhile.
On top of that, after several expansions of making trade goods more plentiful, Blizzard is making components for common consumables scarce again in Battle for Azeroth. The new flasks require a rare herb called Anchor Weed, which spawns randomly in place of other herbs, so it’s not plentiful anywhere and is difficult to farm in quantity. It’s much more precious than any commodity that herbalists have seen in several expansions.
If the new Battle.net balance has given rich players a new incentive to liquidate, and the spiking prices are a result of them trying to sell all their gold at once? Prices for tokens could settle much lower once that stash of gold has been depleted. This seems likely, because there’s a compelling new reason to sell gold, but no new reason to buy it. Blizzard has a good way to drain those gold reserves from the market.
There are several reasons why this may have happened. First, only a fraction of the players who interact with the auction house buy or sell WoW Tokens. While the value of both gold and commodities plunged relative to real money, the value of gold and commodities remained steady relative to each other. Players who didn’t interact with the Token market could buy the same number of flasks by doing the same amount of world quests, or selling the same number of gems or enchantments, so these sellers saw no reason to raise their prices.
And the methods that gold sellers were using to harvest gold were wreaking havoc on the game. There was no way to stop the selling of gold as long as there was demand among the player base to pay for gold with cash. But there was a way to kill off these parasitic and predatory businesses that were involved in selling illicit gold: In April 2015, Blizzard took gold selling legit with the WoW Token.
Earthen Ring-Alliance-USEarthen Ring-Horde-USEcho Isles-Alliance-USEcho Isles-Horde-USEitrigg-Alliance-USEitrigg-Horde-USEldre'Thalas-Alliance-USEldre'Thalas-Horde-USElune-Alliance-USElune-Horde-USEmerald Dream-Alliance-USEmerald Dream-Horde-USEonar-Alliance-USEonar-Horde-USEredar-Alliance-USEredar-Horde-USExecutus-Alliance-USExecutus-Horde-USExodar-Alliance-USExodar-Horde-US
Earthen Ring - Alliance Earthen Ring - Horde Echsenkessel - Alliance Echsenkessel - Horde Eitrigg - Alliance Eitrigg - Horde Eldre'Thalas - Alliance Eldre'Thalas - Horde Elune - Alliance Elune - Horde Emerald Dream - Alliance Emerald Dream - Horde Emeriss - Alliance Emeriss - Horde Eonar - Alliance Eonar - Horde Eredar - Alliance Eredar - Horde Executus - Alliance Executus - Horde Exodar - Alliance Exodar - Horde Eversong - Alliance Eversong - Horde
Garona - Alliance Garona - Horde Genjuros - Alliance Genjuros - Horde Ghostlands - Alliance Ghostlands - Horde Gilneas - Alliance Gilneas - Horde Gorgonnash - Alliance Gorgonnash - Horde Grim Batol - Alliance Grim Batol - Horde Gul'dan - Alliance Gul'dan - Horde Garrosh - Alliance Garrosh - Horde Galakrond - Alliance Galakrond - Horde Goldrinn - Alliance Goldrinn - Horde Gordunni - Alliance Gordunni - Horde Greymane - Alliance Greymane - Horde Grom - Alliance Grom - Horde
As you're leveling, I generally recommend you just follow the natural flow of the progression through each zone. They're laid out fairly reasonably. But don't be afraid to hop around, especially if you're near a quest objective. You shouldn't actually need ALL of the zones listed to reach 62. Pick the ones you like best. It's much more important to simply be as focused as possible and flow from one quest to the next.