I don't see the 'loss of free will' argument as particularly convincing. Since the fall, mankind has had a distorted image of self and of 'things to be desired'. For instance, most of us like chocolate. A perfect comprehension of the matter would not have us eating chocolate to our own detriment; yet many of us do.
I am not particularly attracted to staying out all night in bars listening to loud music and drinking myself insensate to awake with a nasty taste in my mouth, a dry throat and a headache registering on the Richter Scale. Some see this as a loss of free will. I see it as being free to choose better.
In heaven I will have fellowship and understanding of God. I'm willing to decide now to do that and risk the possibility I will miss being confused, lonely and full of self-doubt.