My personal experience is limited to third-party observations. I suspect that the reason you see such a complicated procedure and the deposition is that plenty of people view a workplace injury in a completely different light than you. For some, it is a good excuse for a nice long paid vacation, or even a good payout.
I have a nephew who is quite frankly a stupid lazy selfish liar. He injured his shoulder at work and required surgery to repair it. It was actually an old injury, and he had the same surgery during high school, due to a fight with another kid.
His employer's response was to have him come back to work for "light duty," which essentially means that he sits around and does nothing all day for full pay. Someone got him in touch with a lawyer, who advised him against doing that. He got fired for refusing to come into work, but he still managed to ride out a workman's comp claim for over a year.