Fortunately (at least in the UK anyways) doc leaves usually grow in the same place. So if you get stung with a nettle, then just find a doc leaf and rub it over the area stung until the juice comes out, and the pain will go away.
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Hi Temper,
Never used Dock but the plant of choice here is Jewelweed (Impatiens capensis and I. pallida) which is also the much touted natural treatment for Poison Ivy (Toxicodendron radicans, and R. rydbergii). Another plant used for Nettle sting is Common Plantain (Plantago major) although it is a lot less succulent and moisture extraction is more difficult.
Doc