Sorry if this is inappropriate, but for people looking for a tool like this or Workflowy, I want to suggest Dynalist, which has the simplicity of Workflowy but also a bunch more features. Cloud-based, always synced, mobile apps, easy sharing, calendar integration, etc. I'm a die-hard vim user but I still use Dynalist because it's so great.
I'm a paying user but have no other affiliation (ask me if you want a referral code though). I just want more people to use it so the creators are successful and keep improving it.