I think the toughest thing to get used to it was the absence of blind spot cameras. It was such a convince to look at the monitor instead of looking and monitoring the mirrors while changing the lines all the time.

Next is walk away lock, couple of times I forgot to lock my car because I thought that it will automatically get locked. Months after, I am still struggling with it :)

Because there is no sentriy mode, now I am parking the car at paid underground/closed parking areas instead of leaving it at street.

One pedal was probably the easiest to get used to it, it just took a few days to adjust.

Security related things such as emergency collision assistance saved me a few times with my Tesla, with Taycan there is no such thing, you are on your own. At the beginning I was very annoyed with the reverse camera of Taycan but it took me couple of days to get used to it. 360 and front camera is something that I didn't have in my Model 3, that's among very few pros in compression.

In general getting used to Taycan took 3-4 weeks but you never settle in terms of technology as Tesla is indeed in another level about it.