> Photoshop frees a lot of people from the inability to express themselves in the exact way they want.
It's not quite as binary.
Creative urges and most other human endeavours do not exist in a vacuum.
If you are at a friend's house--say a fellow artist, and he shows you how to effortlessly create new art with Photoshop. You might be impressed and enthused and say: "This is great! I want to be part of this," but your artist-friend would have to say: "I'm sorry, but I can't give you a copy, I promised I wouldn't do that" or, more likely, he would have to break laws to support you in your enthusiasm.
Now, had your friend be using GIMP he would gladly have given you a copy. Not only because he's your friend and wants to support you creatively, but also because more users generally leads to more development and a better program. He's not just helping you, he's helping himself as part of a greater creative community.
So no, Photoshop doesn't completely free you. Someone would have to break the law, or you would have to submit yourself to an arbiter to ask them if you can be part of their community. Usually they just ask for money and a promise not to let anyone else be part of that community without referring those people to them.
Free Software lets you share your ambitions without breaking laws or referring to an arbiter. It's a decision you have to make for yourself, but one choice does not free more people to express themselves by default, even if it might feel more free towards your own person at a particular time, but that freedom is not transitive.