The note in note thing took some getting used to in the beginning. I didn't like it either.
I don't just type notes, though. I do LOTS of handwriting as well, and LOTS of diagramming. In that context the floating text/note boxes are really, really useful.
I'll have a single note with a diagram in it and several explanations floating around.
Or I'll have a vertically scrolling note alternating between text, pictures, and diagrams.
The way I use OneNote has made the note in a note thing really useful.
But every now and then when I'm just typing some quick info out it gets in my way. I just have all the context of it being a useful feature to make me tolerate it.
To be honest, it's the best feature of Onenote is that you can arrange everything on the page (at least on desktop - win/mac) any way you want. Yes, note is kinda a note in a note, when the latter is a page.
Nothing extraordinary.
I absolutely hate Onenote due to how it looks and forcing you to place a note on your note page to make a note :D