So far I just use it for to-dos and occasionally to wrassle through any exercise that requires hierarchical data. The only other app I am using right now for this kind of note taking is The Archive, a zettelkasten/personal wiki app that has a similar “bare bones” feel.
A long time ago, these needs were met by OmniOutliner and Voodoopad, respectively, but the last few versions of OmniOutliner just don’t feel very good to work in. And sadly, Voodoopad seems to be drifting into being unsupported.