I haven't had a feeling anything like that since about any time. I know it's probably in large part because of my age at the time (early 20s) but there was also just so much going on and the feeling was so intense, and youth culture was so on fire, so much energy. And in our tech industry, where I was just starting to find my foothold... there was this feeling in technology like if you just found the right combination of tools and ideas you could really be at the forefront of something new.
Dropped out of my BA in philosophy to join the fray and write code. Weekends full of raves, neat parties and music, meeting all sorts of people, and feeling like tech was part of something progressive and world changing in a positive and utopian way rather than ... this place where we are now.
The .com financial crash definitely exploded the euphoria. But more than anything 9/11 really was the thing that let the air out of the balloon for good.
Sept 12, 2001 I think was the beginning of this current era of paranoia and fear.