A 22.3% overall drop in experience required for levels 20-120 has been datamined on the World of Warcraft patch 8.1 PTR according to Wowhead.
So, funny story.
I took a Death Knight to max level first in Battle for Azeroth.
Above everything else, for me at least, Legion was the expansion of alts.
I haven't hit the account limit on WoW characters yet, but with all these new Allied Races, I might.
With Allied Races and the updates to leveling in patch 7.3.5, it seems everyone is leveling a new alt, if not outright boosting them to level 110.
I was watching my friends chat on Twitter as I do, and one of them said that every since they changed Mercy's ultimate he's stopped playing Overwatch -- he was a Mercy main and since the changes he no longer enjoys playing her, and by extension, the game as a whole.
If you're planning on leveling an alt, it's worth hitting up Brewfest and then heading over to the Darkmoon Faire -- or using your Top Hat if you have one. If you're leveling through Invasions already, a solid 20% XP buff will make it go even faster
I've never really been someone to stray away from my Priest for very long.
Legion as an expansion has solved my 'I don't have anything to do' problem from Warlords.