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.

I can understand some people like it, I however don't - not my thing :)

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.