I think that describes a mature movement which, which the benefit of hindsight, is given a narrative in history books. In addition, the histories and our memories must necessarily omit most of the detail - we see the forest, not the trees and underbrush, the bogs and ravines. Reality is much messier. It's like comparing a mature company or even industry to one in its early days, when there is chaos, shifting goals day to day, and massive uncertainty.
Just off the top of my head, the civil rights movement had many conflicting groups and goals; there were the hippies, communists who tried to co-opt the movement, black nationalists who had other goals, violent left-wing radicals, labor, and many more each with their own perspective and agenda.
I don't know that the Occupy movement started less organized than successful movements; my impression is that the question is whether the movement does get organized later. There was a great amateur video clip from the last election cycle where Hillary Clinton was talking to some Black Lives Matter people; they were talking past each other, which was too bad, but Clinton was trying to advise them - a real expert and veteran of political movements providing some personal advice. She was saying that if they want to achieve their goals, they will need organize, develop certain strategies, etc. (They didn't trust her, so I don't think they were interested in advice. But now I want to find the clip and see what she said.)
Also, let's not talk about the civil rights movement in past tense, or only in context of rights for black Americans; it was and still is about rights for women, Native Americans and for everyone else too.