I had several 80s in real wrath. I just leveled a paladin and priest 1-80 in WotLKC. I found it far more tedious than I remember, even with the 50% buff. Most of my 80s in wrath probably only had to do 70-80 though.
I think RDF spam leveling currently is slower than questing. I had leveled a Druid to 80 with the buff awhile back just before they added RDF and I think that was actually faster.
Without the level scaling system retail uses, there’s also a lot fewer players to potentially queue into in various level ranges on top of the dungeon quests not being in the dungeons.
Hopefully the dungeon version of Call to Arms is added to Cata as well which should help at least with max level RDF queue times (would be nice if they added it to leveling dungeons as well). It was originally added in 4.1 so it should be in CataC.
I do still think there’s some unannounced leveling improvements we haven’t seen yet since they were advertised when CataC was announced but we haven’t seen or heard more specifics about yet.
Improved Leveling Experience
Rise to new heights of power with a smoother and accelerated leveling experience.
This is mentioned in a section about improvements where every feature listed is something that wasn’t in original Cata, so I expect CataC to have faster leveling than the original.