I just started levelling my 2nd group from 70 to 80... its way more painful than I remembered it being.. but I had the motivation of the rush to 80, and seeing all the new content for the first time when I levelled my 1st team...

For my 2nd team, I am trying to accept collection quests as soon as possible, working on the other quests first, and turning them in when they get complete, only grinding out hte remainder fo the collection quests when I have completeld and turned in all other quests in the area...

This way, I can collect a collection quest over the time I did 2 or 3 steps in a chain that didn't have collection quests in the area.

70-80 is horrible though... I wish Blizz would add some feature to reduce the levelling requirement on accounts that already have a max level toon on in.