Unlike angels who are pure contemplators, humans have both active and contemplative lives.
As a result, we live in 4 time periods: past, present, and future in active life, and timelessness in contemplation and thought.
There must therefore be two parts to the afterlife: the contemplative heaven and the active paradise between which the blessed are able to switch at their pleasure.
And the important thing to understand about paradise is that past and future are inferior tenses to present.
It is the present that is the fundamental reality. We will of course have memories and be able to foresee or anticipate the future, but these powers will recede into background.
There is no reason to dwell on the past or future when the present is so blissful. Therefore, no pleasure in paradise will ever cloy or become boring. Every moment will bring fresh joys.