I was worried about getting enough bamboo to make a reasonable amount of scaffolding as a mapping program showed no 'Bamboo Jungle' biome within 20,000 blocks in any direction, but managed to find 3 sticks in a shipwreck chest. Man is that stuff easy to multiply!
From those 3 pieces and 16 bones (made 48 bonemeal) in 5 minutes I had over 2 full stacks of it. Planted the 3 pieces in sand, threw 5 bonemeal on each plant and then harvested. Replanted 3 and repeated. This is so easy and fast, it's not even worth the time to make an auto-farm except maybe for the fun of it.
When it first came out, I converted one level of my sugarcane farm into a bamboo farm for a couple hours. Now I have a mostly full shulker box of scaffolding. I say mostly full because for whatever reason I can't always find all the pieces that drop after a big project.