Despite the fact that 9/11 remembrance may be overblown in relation to world events as a whole, it did shape our time more than a lot of tragedies occurring elsewhere, BECAUSE it happened in the United States, a major driving force of world politics, economy, and western culture. It probably also affected the minds of more people (at least in the western world), it took us by complete surprise, resulting in a string of political reactions that ensured our lives will never be quite the same. This whole wave of highly publicized terrorism that started with 9/11 seems to me like something similar that people in the 80s went through with the cold war: a state of the world that seems unstable in a way that we living in countries such as the US and Finland had perhaps felt distanced from following such events as the fall of the Soviet Union, and the Yugoslav wars.
I can't speak for all, but I for one do feel a difference living in a "post-9/11" world, though I'm sure growing from a 17 year old to a 25 year old affects one's view of the world regardless of its events.
At any rate, I have faith in that the majority of the people directly affected by 9/11 have managed to pick themselves up after this event that shaped the rest of their lives, and I still feel dread when I try to relate to how those people in the buildings, or in the planes must have felt when it dawned on them that there was no hope of survival, just as with anyone who knows they are about to die.
Looks like we're not going down after all, so nevermind.