Hey I'm with you buddy!
I just purchased NBA2K20 base. (67% off,Few weeks ago)
Mostly, I just play MyLeague. (mostly like 99% of the time)
So far, nothing much difference compared to NBA2K19.
Animations are a little different. Slower it seems. A little harder in HoF level.
But I use 3 main sliders.
Shady's here at NLSC. plus Schnaidt1's and Eccentric Edition at Operation Sports.
(Seems to be the 3 most popular sliders

)
I'm into like 15 seasons in MyLeague in my NBA2K19 and I was hesitant to start all over again at NBA2K20. (I play 82 games per season, but using simcast)
I'm playing the first season now in NBA2K20 and it feels like when you play an RPG game and you finished it, and want to repeat and play again to feel good about the progress.
Besides the "little more realistic" gameplay and animation for this year, generally, it is really like NBA2K19. Just as what everybody's saying.
Well, that's basing from MyLeague experience.
Like almost all are the same in Myleague, even the annoying bugs. Still there.
I'm just finding out if I will still be in the mood of continuing the 'fresh start' of NBA2K20 MyLeague or go back to my '15seasons-in' MyLeague in NBA2K19.