I'd contrast free will with forced decision-making, in an appropriate context. There are various human experiences of choice or compulsion, and "free will" describes a particular experience of this type.
I don't think that there's a phenomenological experience of volition which is radically different from other kinds of experienced choice or behaviour, and I can't see anything special about it which leads to the loony dualism that appears on this thread.
I suppose that "free will" is a useful phrase for an aspect of human experience, which has unfortunately developed into a loaded abstract term. You can undermine or collapse most abstract concepts if you want to, without anything very important being demonstrated.