(Sorry, had to be said.)
We're seeing young Spock in the new movies just like we're seeing young Kirk. The little we saw of young Spock in "The Cage" would lead one to believe he was more emotional as a young man in the prime universe, too.
The interesting thing about this Spock is his explanation for why he doesn't want to feel. He's closing off his emotions because the feelings from the loss of Vulcan are just too much to endure. Someone in a review of the movie likened it to how Holocaust survivors in real life coped with their horrors by simply choosing not to feel.
Lest we forget, Spock is a very complex character (both of them).