Rolling stone is a symbol of a successful and happy person. The meaning of our life is to roll the stone joyfully. Sisyphus labor is a symbol of how the stone is rolled without pleasure, a symbol of the primacy of the goal before the process.
In Paradise, people are busy with endless work. Work is joyful. Creation is joyful. In hell, people are busy with endless rest, entertainment and games. Life in hell is filled with monstrous suffering. An eternity without meaning, what could be worse? No amount consolation and joy not will save sinners from this nightmare.