Oh yeah, you can use them for increasing the output per-rune for runecrafting, for increasing the yield of harvests when farming, and for enhancing potions when potion crafting. I like it for runecrafting because it seriously reduces the time it takes to meet guild and quest quotas, and I haven't done tests on this to confirm, but farming says you get XP per crop and I believe that makes it an XP multiplier when harvesting crops. Plus farming dailies can get you a lot of XP, and you can contribute to those from inventory, so having a larger stockpile of crops helps a lot. I've prestiged Farming twice and timing it right with guild dailies can launch you from one to like level fifty in a single batch of dailies.