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I think it's like the builders (who repair huts when they have nothing else to build) -- doctors can gain a little skill by studying the cactus, and if there's no one sick, they have nothing else to do

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Your villagers can practice medicine on the cactus and the other plants. It will improve their healing skill (unless they are a master , of course. You can force them to practice on the plants by dragging, but if you make their primary skill healing, they'll try to practice healing by studying plants (in the absence of sick villagers). I believe they do , in fact , default to the cactus.. gotta default to something