... is still a very tedious level range, and as observed previously, the update to the Elemental Evil campaign hasn't actually made it more fun (in my opinion). I was however pleased to find that there are more alternative XP sources in that level bracket now than ever before.
For example you can start the Underdark story as early as 60 and it actually scales the content to your level instead of scaling your character - though my pet tank and I had issues with that in at least one chapter where we walked in and found that all the mobs were level 70, so I'm guessing that tech still has some kinks that need working out.
Also, Sharandar is genuine levelling content now! I was wary of going there since I still remembered the early Elemental Evil days, where the game would prompt you to go there at 60 even though everything was level 70 and you'd just get trounced because the scaling was pretty ineffective. The in-game map also still told me not to go there at level 69, warning me that the enemies were too high level. However, while looking over my pet tank's shoulder I noticed that the first area in Sharandar is now genuinely level 64, the second one 66 and the third one 68. So you can get a head start on those boons now and the dailies give great XP to boot.