Dramatic! It would be interesting to know in what way a driver alters their driving for those situations. They seem to be braking at the start of the video when the first waves are seen but maybe that's for the approach to the station.
We don't alter driving style unless Network Rail impose a 20mph speed restriction along the seawall of which we are stopped and told in advance. We would also brake earlier for the Dawlish and the approaches to the station can become quite slippery.