Trees are annoying. You have to chop the log in the middle, then clean up the rest of the mess. With this Addon by Keyyard, you can clean up the log and therefore the leaves in one smooth chop. Get close to the tree, sneak, and break the bottom block, and the rest of it will break. The leaves will also start to despawn after a couple seconds.
As you can see in the image below, you get all of the wood and materials back from the chopping. This would be a interesting minigame mechanic to add into a level or a standalone game.