Indeed that is a film that makes you think, and as said it's long enough to really hit home, if you dont flick the channel.
I've been known to text while driving in the past, not that I think it's a clever thing to do in any way and I no-longer do so after a near-miss that I'll explain below... but as I can actually write and send a text message without ever needing to look at the phone it really didn't seem that much of a distraction, and I assume this is what most people think - my eyes never left the road once during the whole process and it takes no more thought than typing does - if the thought is in my head it comes out my fingers without aid, I dont need to think how many clicks I'm doing, what order etc. If the phone threw up the odd fault (mis-keyed a word not coming up on predictive text) it beeps and I'd put it down and ignore it until I was stopped, say at a junction in traffic. Same with reading them, I'd not read while driving but I'd always read when I was stopped in a junction, it takes what, 2 seconds to look through the message?
However I did, eventually, succumb to temptation and look when it beeped an error at me. Now in actual fact it's no more dangerous than looking at your stereo to change channels, but in that split second the car in front slammed on for an animal and I (fortunately at a decent distance) had to emergency stop in order to not hit him. Would have had to do the same anyway even if I hadn't looked down at the phone, but the fact that I DID look down at the phone made me question whether it was a cause (which on later reflection I realise it wasnt, but it was a lot closer than it needed to be), but by habit I just leave the phone in my pocket now.
The anti-texting people suggest that it takes a lot of concentration to text, lots of looking down and typing - it really isnt the case for a large number of people, and anyone with any sense can wait until they're stopped in traffic to read a message. However it seems theres also a large number of people for whome texting takes a lot of effort, though they don't realise it, I've almost been victim to these people myself - people staring at their phone while driving and drifting about the lane - these people should not be allowed to, as they are incapable of doing the two things at once. However in the end since you cant do a test to see who is capable of texting without losing concentration on the road, and you have no way of knowing who is sensible enough to priorities driving and ignore the phone when it's not safe to use it, their banning is a great idea and this vid highlights the reasoning to those who are tempted.