I've been surprisingly sad since I heard the news. I use "surprisingly" because I wouldn't expect to be so sad about the death of someone I never even met. But from everything I've seen, read, and heard Leonard Nimoy seemed like a genuinely nice person. And he was Mr. Spock. Everyone loves Spock.
The death of Spock was one of the more traumatizing movie experiences of my childhood. I was only 3 when Wrath of Khan came out, but I watched it some years later on TV with my mom, the fangirl. It was quite a shock for me, I remember it vividly. I am sort of re-living that moment now ...
RIP