I haven't been on the forums in a long time but I opened them up just to see what happened with the free form tool, I will admit I don't use it that often but I find it useful for filling it outlines that are antialised without having to muck about with paint brush sizes. Though I like some of the new shape options, I feel like I have much less freedom now.
In particular, I would use the free form shape for it's 'complete the shape straight edge' (whatever you'd call that) when filling parts of a shape. As an example, I'm currently creating a diamond shape that I now know I could have created using a combination of triangle shapes, but I still find it easier to control dimensions and ratios with lines first.