I guess I can comment on this now...
I've only parked in Jurassic, but I found the process from a guest flow perspective... suboptimal, to say the least. It is not very clear where you are meant to go when parking in that garage. The existing Citywalk-side traversal infrastructure (i.e. elevators, escalators, and stairs) are insufficient to process the number of guests that need to go down, and it isn't immediately apparent that there are new escalators to the far side. Bizarrely, it didn't seem like those escalators even travel to every floor of the garage.
The security checkpoint itself was smooth and painless. It's the getting there // returning to your car that caused more friction than I expected.