No. There's a lot of information and you need to figure out effective ways for YOU to learn it. You work as much as you need to in order to be competent/pass exams, that's it. If you can work efficiently you can work a surprisingly small amount, if you can't you can end up working every day.
That article is completely fallacious, ignore it. The people on most Medicine courses are interesting, varied, and are definitely not anti-social. Medical students have been interviewed to determine the level of their interpersonal skills and therefore these "oddballs" or "psychotics" should be in the minority.
The workload is greater than A Levels, but, the content is at about the same level. IMO, work little and often.