A painter can paint a picture in extreme detail. But then the picture is only that, a picture. It doesn't change. And a writer can write a wonderful book that becomes a best seller. And the book will be remembered but only the entirety. Few lines will be recalled well enough to quote.
But poetry.... sure, it's just words but a true poet can use them in such a way to cause a picture to form in the reader's mind. But the picture will be different for each reader. Thus it is more personal than a painting due to each reader filtering it through their own experiences. As as opposed to plain prose poetry has a rhythm which when done correctly encourages the reader to memorize at least some of a poem.
So, we as poets can sometimes blend the best of art and literature into something which will be around long after we are gone.
Now, go ahead everybody and tell me how wrong I am.......