I quit in WotLK pre-patch and played very little sporadically from then on for every expansion release so I have a not so good grasp on what happened to the state of the leveling, all I know is that when I tried to start a level 1 in 2012 it wasn't engaging enough for me. Anyone that can fill in the details when this happened or when it started?
I played on some WotLK PServers and there were some stuff that changed, such as looms (optional though) and some TBC spells that came in levels 10-20 (Victory rush for example).
I should add that I'm talking about combat and combat pacing, and not about xp per level or mount availability.