They are already so massive that destroying them just takes so much time. Probably the most useful of this mod would be taking down Jungle trees.

What’s great is that it also destroys the remaining leaf blocks and gives you all the saplings that would have dropped. As soon as you do the entire tree explodes into all its individual blocks. It works simply by using an axe to destroy the bottom block of any tree. This mod is a great addition to Minecraft to significantly speed up the removal of trees in the game. So, with mods that add axes into minecraft like IndustrialCraft 2, or mods that add in trees like Forestry, you can make sure that you’ll be able to use all of your ax items, and cut down all of your trees. You can also mess around with the config file to change things like what’s considered a tree, how many leaves the trees need to be considered a tree, what an ax is, and whether or not you need an ax. So, the next time you see one of those twenty block high monstrosities, you won’t think of how much work it’ll be, you’ll think of how much wood you’ll get. TreeCapitator Mod 1.12.2/1.11.2 adds one simple element to the game: axes cut down all wood touching the wood block you cut down.

Minecraft 1.11.2 treecapitator