Yes, in wow the best thing for me was to level Pj`s, it has to be something that cannot be done in just two days and that is enjoyed as much as almost as the end game
I think that wow doesn't congratulate the fact of leveling since MoP. Classic, TBC, even Lich got something that was really good. It's really hard for me to explain it in English, so i'll use google translator. (I've done a spanish post into Suggestions explaining something about the leveling meaning).
In Classic, TBC or Lich, the experience of leveling up was complemented by professions, class missions, quest chains until reaching those of the dungeons (there were also those that were a single quest and you did not have to do a chain previously).
The need to buy skills, their ranks, buying riding, and the management of gold for various functions got something special for me (and for many i know). Resting every 1 or 2 enemies (hopefully, if you had pets or if the mobs weren't at the same level).
Endgame of that game versions needed progression, like wow did during 15+ years launching new expansions and patch contents (and every progression game lol) but i think those got only the most needed things and not "casual farming content" like now.
Currently, wow has a lot of content focused on old raids and dungeons, like achievements, pets, mounts ... and that generates that "independence" of being able to make a variety of content and not necessarily have to do something with people which forces you to tryhard (even it's not hard but i think a mmo needs a "easy for all" content, and farming is perfect for it). For this reason, the scalability factor that they propose from 10 to 50 is good for the leveling progress, but at the maximum level there's a possibility of "rushing" those dungeons which, by the way, it would be very good to think about that can drop mounts / pets at low rates. The farming incentive tends to move many ppl.
Thanks for regarding, and sorry for my English.
See you in SoH.