Well, this only works with Druid Flight Form.
As far as i tryed, i did it on:
1. A Chip Off The Ulduar Block
2.Jack Me Some Lumber
1.Just find blocks that are not in aggro-zone, then use bomb and exactly after you put it down go flight form and get back a little than loot. Normally, you will get aggro and have to fight those stupid gnomes on theyr mounts, but if you just stay in flightform all time you will save more time.
2.You all know that at this quest, if you chop down trees you get attacked by treants. Well, just when the Chop casting is like 0.1 seconds use the flyght form and go up, treants will spawn but you wont get aggro.
This is pretty common sense, but i`m shure most of the druids didnt use itYou just have to be fast and go flight form in the right time. This also works on many other quests there.