I found Everdo while looking for an alternative to MyLifeOrganized, in which I have a few thousand tasks accumulated over many years. It’s true that I don’t actually really get to do those tasks, so I understand why @Andrei prefers to keep the tool simple and not implement hierarchies (<-- the most current discussion about this feature request, for those who land here after a search).
My use of MLO is more as a place to mind-map the myriads of tasks I hope to get to some day, each with resources in its notes. Then when a task becomes urgent, I can refer to its associated resources (subtasks, notes etc.).