For one thing without SSL the connection can attacked by a man in the middle and something harmful could be injected in that site.
That particular content is innocuous but you’d better believe there is some static web site you could visit that could get you in trouble with some government somewhere.
It’s not so clear what might be sensitive somewhere (maybe your work doesn’t want you wasting time reading stuff like that when it has nothing to do with your job.). If all sites are encrypted, not just the sensitive ones, the job of mass surveillance becomes a lot tougher.
The Snowden revelations were no surprise to me, the NSA was founded to do exactly that. SSL became popular because of mass surveillance being perceived as a threat, it is not just the NSA, other countries like Russia, France, Israel, Iran, etc. would do the same as well as organized crime groups, “hackers” and such.