This review summarizes well the triumphal Protestant narrative of Reformation history: Europeans learned to think outside the box in the Reformation, thank goodness for this leap forward.
Except that so much of Reformation history involves groups that left the big, rather loose box of the Catholic Church for smaller, much tighter boxes. For example, the medieval Catholics celebrated beauty in their art and architecture, but English Puritans shot all the stained glass out of England's cathedrals with musketballs and used the buildings as livestock barns because they thought any human attempt to create beauty was blasphemous. Hence Christ Church at Oxford is the only English cathedral today that still has its medieval stained glass; the churches of Holland and Switzerland fared little better.
These English Protestants were the same thoughtful people that settled on our shores in Massachusetts, and the government they set up there appears far more like a theocracy than much of the medieval world. I'm not saying the medieval world was better, or that there wasn't plenty of good that ultimately came out of the Reformation, but the situation is rather more complex. One can be in the Church and think outside the box - Dante, Aquinas, Petrarch, and Michelangelo all certainly did. The Reformation is the story of religious disunity, not necessarily religious freedom.
And was the medieval box, after all, really so horrible? Sometime after the year 1000, when outside invasions slowed down, western Europe began to vastly outstrip the rest of the world in improvements to quality of life, material well-being, and individual freedom, a process centuries underway before the Reformation dawned. The Church should probably be given some credit for this, if it was as all-powerful as people say. And most European cities, even today, will point to their medieval cathedral as their most proud cultural artifact. Looking at the faceless architecture of now, one asks, does the mind soar as it did then?