To be honest, I use herbicides when I have to. I have had two badly overgrown allotments and it was one of the way to tame the beast as I am still in full time work and juggling having day release and a pregnant wife (Due monday.)
Used appropriately they can help. Truely organic - i would say imho is if you are experienced or if you walk into an established site, where you take over from someone else, alot of the hard graft is already done. If you take a plot on 6 foot high in brambles, where is the organic principle going to get you besides depressed. Sorry been there thought organic, no dig etc got dishartened, chopped down brambles and sprayed the lot. Now that was satisfying and it blooming worked. Used one of those sprays that goes into the roots (Allegedly.)
Sorry long day and letting off steam.