Also as was said in the video, it might seem reckless and aggressive to the outside observer but when you do it yourself it feels much more natural and easier than you'd think. I disliked it at first but I've gotten my comfort level up and it's much better. As long as a car isn't hugging the lane there is plenty of room.
It's much better than sitting at a dead stop and hoping nobody rams you from behind, from which there is little to no chance of escape. That's why I rarely if ever take the bike out of gear at a stop, though, just in case.