I registered here to answer this question. So: "Hello everyone!"
My most amazing experience on a dancefloor has been a while ago. In 1998 I was in Vashisht (India). I went to quite a few great parties in Manali, which is close by. Those parties were very small, financed by a donation box in the middle of the dancefloor, and generally very trippy(!). I remember a certain very small party in the mountains, the sun was rising above a snow covered mountaintop exactly at the moment when the track "Panic in Paradise" by X-Dream was reaching its peak. It was one of the most beautiful experiences I ever had!
No party after that was able to come even close, and I already had lost hope that I will ever be able to experience true magic on psytrance parties again, until: 2008. My first Ozora (I was on Solipse 1999, too - which also was a very nice party - , but it wasn't called "Ozora" back then). The moment when the dancefloor was opened to the public, but no music was playing, yet. The people were slowly walking onto the dancefloor. It was very quiet. Nobody shouting. Everybody in quiet anticipation of the things to come. We were all just standing there, for at least 30 minutes (or so it seemed). It was a very beautiful, peaceful atmosphere. So beautiful indeed, that I had tears rolling down my cheeks. I was really touched! Needless to say: the party didn't disappoint. And I realized, that psytrance is not dead. There are still awesome parties to be experienced.
Edit: I have never been to Japan, but in 1998 there were quite a few Japanese people around on the parties in Manali. They were really crazy, but not in a bad way (not like the Israelis ;-) ). They were always respectful to the local people, but when they were on the dancefloor there was nothing holding them back! I *loved* them!