Well, if you ask me, I'd think that for example when Melian, as you say, protected Doriath, there was nothing that would need to rejuvenate, because nothing could be harmed.
But most importantly, I think actually in the 1st age the Rings were already not needed. The Firstborn were strong and the world didn't yet start to fade, so there was no need to rejuvenate anything. Remember Treebeard's words and his song about the forests he visited, for example. All the big losses came with the end of the 1st Age, when all of the wonderful lands of Beleriand was lost. And then, the Rings were able to bring back some memory of Doriath, Gondolin... in Laurelindórenan and Rivendell.
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"Should the story say 'he ate bread,' the dramatic producer can only show 'a piece of bread' according to his taste or fancy, but the hearer of the story will think of bread in general and picture it in some form of his own." -On Fairy-Stories
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