I highly recommend reading them.
Start with the 4 most important ones, the “Constitutions.”
One needs to understand that these are very complex documents. They do not just come right out and say what they want to say. They are very academic and very dense. It takes a very long time for the Church to make a point in those documents exactly because the process is to first lay the foundation and the reasoning behind the idea, and only articulate the idea itself at the very end.
For example, the Constitution on the Church in the Modern World, Gaudium et Spes starts by talking about Creation. How’s that for starting at the beginning?!
These documents were meant for the centuries. They were not intended to be just read in a single sitting. That’s why many people start to read them, then get discouraged and stop. Understand that they take a long time to read and understand. Expect that. They’re supposed to be like that.
The biggest mistake is to read commentary about the documents instead of the documents themselves. Inevitably the reader will come away with the author’s own biases, and not the genuine intent of the Council Fathers. The earlier the writing, the more this is true.