i agree ... i just hit 70 with all 5 of my toons. I tried many different things to make 60-70 go as fast as possible over the past month, but questing was by FAR the fastest route. I've got a decent instance running team (1xpally, 1xpriest, 3xmage) but could not nearly match the xp of questing - maybe others who know the instances well, and have more experience can, but I couldn't come close. I even tried AOE grinding, but unless you have a ton of rested xp and a large group that repops fast, its no good either.

/agree with multibocks - Skip collection quests - they are a MAJOR pain with 5. I would suggest doing them with 2, "maybe" 3, but it's still a time waster, as there are other quests that will level you faster. When i lvl my other team from 60-80, it will be all questing.

You need questhelper and tomtom addons for sure. go to a new area, grab all the quests, then use quest helper and tom tom to plot your route on the map efficiently.