Whilst I can only really answer anecdotally, no none of my friends are traveling more or less than at any other time.
I would say yes there are some people whom are more fearful now than before, but that's not limited just to travel, that's just a result of our current saturation media environment. It's not enough that we need to be told of every disaster which has happened, we now need to have "special event" programs dedicated to it, we have a week of analysis on what went wrong, rehashing the event from every different angle (although surprisingly still in a biased way) we basically have the media feeding us fear since fear sells ad space.
So are people "afraid"? Yes. Does that stop people from travelling? I'm going to say no.
Interestingly enough, terrorist attacks against airlines and in western destinations is very rare these days compared to the 80's. I remember as a kid hearing of a bombing in the UK was not exactly unusual, and having terrorists hijacking planes was a somewhat frequent occurrence, however the difference there was it was a 2 minute story on the 6pm news, and they would then move onto the next story.