I no longer need to burn certain amount of hours in front of the computer. My compensation is based on my results. This is probably the biggest change that happened for me -- it allowed me to think about my overall performance as something I do and optimise for myself.
Another thing is that when you work as an employee you are getting bunched up with other people. This is fine if you are an average, but if you work every day to excel and improve your performance you are doing yourself disservice because you are subsidising all those other people who barely pull their weight or don't do it at all. My results are now tied to me and my image and people notice, tell other people. It has landed me many jobs or improved my negotiation position a lot.
Another one is I no longer fear of loosing a job. When you move from place to place regularly it becomes part of your life and you no longer fear it. I became much better at negotiating and interviewing. When I join, I immediately set up an appointment with my overseer to lay out rules that will maximise my productivity, speed up my transition in but also my transition out of the organisation. For some reason being cool about leaving and planning to make the most of it for both sides does wonders to how the manager will treat you.