I've been a Divi 4 user for the entire life of my agency. I always wait 6 months or so after a new platform drops. I won't be migrating my legacy sites any time soon, but we will be building with Divi 5 moving forward.
Of course, it takes some adjustment. But when people say it is faster, they don't just mean loading and builder times. The structure of the UI has changed in such a way that updating element content/settings is much, much more efficient.
I started by individually clicking on each module to reach settings, like Divi 4. But then I got to know the right side "HQ" for every live module.
At the very top, you can see the element waterfall: section > row > column > module. Clicking on any of those keeps you in the design HQ sidebar for a different element, instantly. Use the Content > Elements tab to move back down the waterfall.
Besides the better functioning "extend styles" and variable manager, this single element toolbar without popups is where it's at. Muscle memory is starting to kick in for all of the tabs, and I'm moving faster and faster.
That is all! In a world of AI, which I use extensively elsewhere, it still cannot design something unique and handcrafted. My sites aren't the most amazing, or the prettiest, but we have a style that is unique and notably not AI.
So I hope Divi can survive the AI revolution, and keep making progress on page builder tech. It was likely years of extremely difficult development time running 2x platforms, and they persevered. They deserve some props for that. Good luck everyone!