EXCEPTION: If you have Mining and only use Jewelcrafting to craft stone statues (for additional in-combat healing), then this may be a useful tradeskill. However, like Engineering above, it should not be a leveling focus and should only be used to assist with power leveling. Doing any more than this will become costly and should not be undertaken during the power-leveling process.
If you want to up your character to 100, 110 or even 120 level and take the adventures of current content, we can help you. Here you can buy powerleveling and not worry about problems, because we all do it yourself, without using additional programs. Our players do quests and farm dungeons. You will be pleased and will not spend weeks in order to achieve the desired. We will do everything in two days! Raise the level of character to level 90 and get a lot of new things. Don’t waste your time in vain, and immediately go in search of adventure.
Anyway, there are no more shortcuts. There are no more "Tricks". It's just straight questing now since Blizzard nerfed other methods of leveling. You can still do dungeon spam, it just won't be as fast. You can still do BGs, it just won't be as fast. Just about the only alternative way to level that rivals questing is Pet Battles(which makes ZERO sense).