...I often think about what is so great about it. What is so different from "the world"?
I don't think much if anything if there is such a place. Let's assume there is a god and this god created heaven and Earth. First he apparently created heaven filled with angels that adored him save one, well maybe at least half of them adored him. This wasn't enough for this god so he created man. Well apparently god didn't eradicate all the emotions and faults that exists right here on earth, for in heaven there is jealousy and even war. Funny thing that war among the angels, a fight for control and power. Doesn't seem any different than the many power struggles here on Earth.
The fact is that all you need to do to get into heaven is accept jesus as your savior. Now that means there are a whole host of problems that go to heaven. resentment, jealousy, hatred, prejudice, sexism, lust, paranoia, everything that has always existed on earth.
This is clear proof that "heaven" was a human construct and not very imaginative either. No self-respecting god would allow human instinct and failings enter in a real god domain, but in every heaven scenario, the human condition exists. Ironically they exist in the same exact manner of the time and geography that they were invented. Vahalla is particularly of Nordic design, Pantheonic gods are intrinsically Greek and of that time period, and the Abrahamic god is specifically related to only the Middle East or the known world of the time which happens to be the first century. Their descriptions of their heaven are also only relatable to the time and place from which the religion originated. Buddhism relates only to India and the Far East.
So "heaven" is no different than earth in any way shape or form. In fact, it is a reflection of earth and nothing more.