I tell you my experience. I'm leveling a priest that it's 60 now and since I have also done some instances (and I have full heirloom set with 20% experience gain bonuses) and been very ahead of the guide, I skipped some zones since they were grey quest for me, well it was a real mess. Missing quests because I didn't to the previous to enable the following. Going in a zone then realizing that I couldn't do that quest because I didn't do the starting quest chain, very unconmfortable. In short what I suggest you it's not to skip areas, or make really sure that you do all the quests required (at least) and check carefully the previous zone you'll going to skip to make sure that you won't have problems with struggling finding where to start the quest chain to sync with the guide section.
Quests from the Tortollans, a race of turtle people, can be mind-numbingly dumb and slow. One of the standards that you'll see is one of those matching games arranged in a grid where you can only turn over two items at once to see if they match. Another, and the worst of all the quests I've done in 13 years with World of Warcraft, is a turtle "maze" where you slowly guide a slow-ass turtle through a slow-ass grid for seemingly no reason other than to get a reward at the end.
Dungeons still give too much experience. Yes, I'll get some hate mail for this. But due to the way dungeons -- especially at some levels -- scale, along with experience buffs, the fastest way from 1-110 now involves grinding one dungeon over and over and over again. It's the equivalent of the South Park "Make Love, Not Warcraft" episode, only instead of killing boars, you're killing endless worms in Ragefire Chasm or gnolls in The Stockades.
Un très court paragraphe pour vous dire de ne pas perdre de temps avec les élites rares. Ceux-ci peuvent bien évidemment éveiller votre curiosité et droppent peut être des objets intéressants, mais l'heure n'est pas à l'affabulation pour le moment, mais à l'optimisation, et les élites rares ne donnent pas assez d'XP pour daigner que l'on s'arrête pour eux !
Something to keep in mind as well is that this will make enchanting materials more valuable, since it is likely most players will now simply scrap their boe greens instead of getting them disenchanted. Also redundant dungeon/raid gear can be scrapped rather than traded to the (guild) enchanter in the run. Less stuff gets disenchanted, meaning there will be less ecnhanting materials, meaning their value will rise. All the more reason to DE rather than scrap as an ecnhanter.