I use a lot of it. In fact, at home it is almost exclusively all I use outside of gaming. I came across this little article that really encapsulates open source software, and the value of community driven software.
There is one group missing from the group, and I feel like it is one I fall into: Evangelists. I believe in the value of things created by the community.
I don't write about it enough, and I plan to, in time. There is just something nice about using something that was created as a labor of love, rather than just a product.
Of course, there are issues with that too, but that is just people.