Heaven is anarchy: everyone does what they want, which is to be good and helpful to each other.

Heaven is a (benevolent?) dictatorship: everyone does what God wants, which happens to coincide with their desires.

Heaven is communism: everyone helps each other and has access to the same resources, although since a lack of scarcity is implied, this may not require helping each other out in material means.

Heaven probably isn't capitalism: given a lack of scarcity, communal access to resources, and everyone having their own housing, organized trade of any kind seems kind of pointless.

Heaven probably isn't a democracy: if everyone agrees on the major issues, why would you vote on them? That said, everyone in heaven chose to be there, so that's the one vote you get.

Note the 3 underlying issues in each of those. Similarity of goals, which isn't going to happen anytime soon; people putting the common good before themselves, which likely won't happen until...; and a lack of scarcity, which won't happen until certain currently-unlikely events occur.