I like using the mouse drag. It just feels easy to just use the mouse to walk as well as look around rather than using a combination of the mouse and keyboard.
It was quite easy to pick up - I had Guybrush walking around the ship instantly in Chapter 1 and I think it's a pretty clever solution. I'm now quite spoiled by it - I was playing Wallace and Gromit and trying to drag them around lol. I've used the running more as well in Chapter 2 - especially that bit where the melted pyrite needs to get through the jungle quick.