If you had custom patterns (via custom code) or by using Justin's awesome Block Pattern Builder plugin, there was a delay of 3-4 seconds for the patterns to be presented for selection..., with this update, the patterns show up almost immediately - impressively fast compared to before.

One thing that is extremely frustrating to me is that only now we are getting some very basic stuff like line height controls and easier button styling for example..., these should have been before Gutenberg was merged in the core, and not 15-16 months after the fact. I would also love to see some of Google fonts insertion to the heading and paragraph blocks for example, with may be with some sort of a warning that having too many web fonts will slow down the site. I can see some abusing the use of web fonts, and making more harm to their sites than good.

The Click and Drag issue when the toolbar is set on top is still not fixed, which makes my hair turning grey by the hour !

Overall though, I agree with Justin, it's a relatively speaking nice update.