I liked it, when I clicked on the path in the swamp region and Astarion decided to run around a hill through water (which hurt him) and set of every trap in the way, in order to get to the point he wanted to stand in. Aside of the fact that visually it seemed he could easily just get there the intended way.

Reminds me of BG 1/2, where sometimes characters raced off through the entire dungeon, to get to their position, just because!

At least in this BG 3 is very close to BG 1 and 2.