As somebody who has been to every D23 from 2011-2019, and who doesn't plan on going this year, I'd say don't waste your time. There's some interesting panels, but a lot of self-congratulatory puff (shout out to my Music of Galaxy's Edge podcast where they spent twenty minutes talking about the great job they did). Also most of the interesting stuff on the show floor from 2011-2015 has been replaced with more stores and upsell activities. Maybe I've become fundamentally disenchanted with the premise behind conventions themselves, but when most of the panels are available online and little of the film/TV footage stays exclusive to the panels themselves, there's not much going for the big events.
That being said, if you do decide to go, maybe do what I did in 2019 and just spend a whole day listening to the artist presentations at the Animation pavilion. If you have to, go to the Animation showcase presentation. This hasn't happened since 2015, but they might show you something substantial from a film they will eventually cancel (Like the opening sequence and plot outline for the 2014 version of the Good Dinosaur, or an entire song from Gigantic).
Speaking of which, I shudder to think how operations are going to be this year. The Expo is getting gradually infamous for botched ops in one way or another, and I don't think the break it's had is gonna' help.
This 100%