I'm just now starting to work on an alt (scribe/herbalist), and have found that it's important to open up world quests. She needs at least decent gear to run around and pick herbs efficiently - and world quests are a huge help with that. LFR is going to help too, now that that's available. World quests also have some nice materials rewards.
I'm just chipping away at rep gradually via world quests. So far inscription seems to be requirement-light for leveling as compared to say, Alchemy. But we'll see. I found that by keeping rested experience maxed on the alt, the leveling-via-questing was pretty painless.