I think it's important to know that Notion works like a content management system (CMS), it works with blocks and pages. Blocks are content elements of all kinds. Pages contain blocks, each page can contain any number of subpages.
As regards my own daily business - personally I love the calendar block, or the fact that each table block is actually a database (with some calculation functions), that even can be set in relation to other tables... Or the possiblity to embed all kinds of stuff - CodePen, Google Maps, Spotify... Or the code block, that comes with tons of formats...