Last year was the first time we had ever tried it and were thrilled with the results - as apparently were the deer.
Because my garden is so large, 1/3 of an acre moreorless, planting deer repellant/safe rosemary and lavendar will be far too expensive to do at once.....so I'm giong to start by planting it along the north side of the garden in the area where we know the deer cross the creek.
We have alot of deer in our area and see them in our pasture all the time but they've never bothered the vegetable garden. I hang Irish Spring soap inside old pantyhose in the trees around the garden and it keeps them out of that area. Someone told me about that trick, says it fakes the deer out, makes them think humans (hunters) are around.