I've been using a Ragfork for thistles, time consuming but satisfying. I had them down to just a few, but couldn't do it for a couple of years, as bad as ever this year. I try and let butterflies and bees have a go at the flowers, then get them before they seed, so timing is critical.
I don't like the idea of using weedkiller where animals graze, unless no option. (Spot treating to reduce the rushes. :-(. )