I imagine that a really satisfying afterlife would be one where we could travel through time and space at will forever and ever. You could watch yourself through time, others, historical events, travel throughout the cosmos.
Imagine finding life on other planets, watching the birth of the Sun, finding out what people said about you when you weren't around. You would be forced to learn the real truth about all sorts of things. You would be compelled to watch your horrible mistakes, to relive to your worst moments (how could you not?!). You could revisit your greatest triumphs and those of mankind. Imagine watching the first fish pop out of the water for a breath of air!
You could endlessly experience anything you wanted as a silent and invisble observer. Who needs a god to stand in judgment when you have yourself and an endless list of peers?