Product managers love their jobs. There's nothing like powering through a project with a team of brilliant minds to come out and know you've all made a difference.
Most time spent being a PM isn't that moment. Much of our time goes in to thinking through complex problems, but the vast majority of our efforts are spent turning ideas into things that work. It's not so much our ideas that consume our time, rather the ability to explain those ideas to entire teams of people in excruciating detail.
The best way to learn is to teach, and the finest way to define a full product is by dictating it to others. Explanation is an art form.
These are some of the most common ways of putting prattle into practice:
Specs are the monoliths of documentation stemming back to the waterfall days. Functional specs routinely range from 100-300 pages