Does the new inline editing of images help you make images the right size? Maybe, but not automatically.
The main benefit is that you can now edit the image size directly in the page and make it the right size (assuming you know what that is). And that’s not much better than before, because you can already choose between multiple sizes auto-generated when you upload an image.
Imsanity 2.7 is coming, woot! Here’s a test image: