The problem currently is that a previous patch introduced a much smoother paced leveling system, though it was definitely slower. Many actually enjoyed the tweak to the overall progression system but ever since patch 8.0 went live, many MMORPG lovers are reported that is unnecessarily difficult to level through some of the older content drops, which was an unintended side affect according to Blizzard.
Island Expeditions are a new idea that digs into the island vibe brought in by Battle for Azeroth and allows players to team up in groups of three to venture out onto various islands to gather all-important Azerite while fighting against enemies on the island and completing quests. The twist is that Island Expeditions are also a race against the opposite faction — whether it's three AI characters or three real players is up to you — but you may have to do a little player vs. player (or fake PvP) if you happen to run into them.
War Mode, enabled and disabled in Stormwind, gives 15% bonus experience for quests and kills in any zone. whether you're a fan of pvp or not, this might be smart to turn on as Alliance starts on Kul'Tiras and the Horde are on Zandalar. Most horde are going to only be on our island for max level world quests. If you dont like PvP, my advice would be to turn Warmode on for the first few levels, then disable it around 112.
At 96 the standard wisdom is to immediately drop what you're doing and proceed to Spires of Arak and do the quests to unlock the Inn, granting a further 20% experience bonus while in that zone. You'll want to do that eventually anyway, but I'm not sure it outweighs the quest experience from Gorgrond. However, if you decided to go to Spires immediately at 96, restrict yourself only to bonus objectives and again leave Treasures until you're 100+. Make certain that when you being the quests to unlock the inn, you speak with the quest NPC to also learn Archaeology, since it's required to collect several of the treasures in Spires.
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
Common methods of power leveling include doing only those quests which are most efficient in terms of experience over time, and analyzing the quests in a given zone so as to do them in the most efficient order possible. Remember, the idea of power leveling is speed and efficiency--you may wish to obtain an addon that will show you how much experience per hour you are gaining to test your techniques. Additionally, ensure your character's talent build is crafted for maximum endurance. You want as little downtime (walking, drinking, eating, crafting, typing, etc.) as possible.
If you bought Legion and have no desire to go through old content, good news! The new expansion comes with a free boost to level 100 for one character. You can buy these boosts from the in-game store whenever you want, but they normally cost $60, so savor this free one. Use it for a class that you are confident you will enjoy. As a fresh level 100 character, you will be able to immediately begin the quest that takes you the Broken Isles, the new region where Legion takes place.
I found that in most cases, I could pick the zones I liked and skip everything else. It was slower, but I still wasn't forced to do quest zones I hated (and, notably, I skipped the entire Cataclysm expansion's content -- sorry, Thrall.) I did do dungeons, both in group finder and by two-boxing (more on that in a moment as well), but only once for the quests, and mostly to clear what felt like an awfully long slog from 40 to level 80.
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.