Welcome. Your first 60 levels will fly by with RAF. It goes even faster from 40-60 because of the massive xp bonues 28k+ for quests if I remember right. You will also fly through outlands especially since normal flying mounts are trainable at 58 now. Just skip all collection quests that you don't you need to do (non-rep related, bad rewards, etc.). 71-80 is the longest stretch you will have, but Northrend looks amazing compared to the previous expansion and zones.

Good luck and have fun!