In reply to Gary Taylor.

Each paragraph is a new block, but the way you write shouldn't change. Try Gutenberg out here, you can see when you hover your mouse or click on a block, then formatting controls appear, but as soon as you start typing, they disappear, and it feels just like typing normal paragraphs. Pressing Enter starts a new paragraph, arrow keys work as expected.

If you prefer using your keyboard for most things, this is also where it gets cool: start a new paragraph, and start typing "/gallery", and press Enter. It magically converts into a Gallery block, so you're able to insert more than just text, without interrupting your writing flow.

So, to get back to your originally question, you are inserting a new block for each paragraph, but inserting a block isn't a difficult task, it should happen as smoothly as possible, and even invisibly when it's just a new paragraph.