The free will argument demonstrates that christians don't understand free will.

[Coffee Jesus]

Don't you guys tend to consider heaven to be an ideal world?

Clever. Except you moved the goal post without addressing your unsupported premise that a god worthy of the name could fully conceive and create the fullness of reality free from suffering. You avoid defending that premise by suggesting that heaven is equally inconceivable. Such is not the case, since heaven is a subset of the total reality and even at that may not be entirely perfect according to your impossibly high standard for what constitutes perfection.

For that matter, what is it that you expect? I suppose God could have just created a giant flawless crystal sphere and stopped at that. Or maybe He could have given us over to all be Lotus Eaters, living in pleasure and doing nothing useful or growing as people.

God made the rules. If the rule is that God cannot make a perfect heaven without making an imperfect Earth, then God made that rule.