My latest one was probably also one of the most intense ones - front row on Formula Rossa. The sun had just gone down too, which added a nice little touch to the atmosphere. Just the immense roar of air in my ears, that tremendous sensation of speed, and my mouth drying in a second because I opened it for some reason. Even if it braked down at the end of the launch, the coaster still was fast as all heck. Too bad it had been closed for most of the day, so that when it finally opened, all the people in the park rushed over to ride it, resulting in 90-minute queues. I got only one ride, but wow it was worth the wait.
Entering the enormous hall of Ferrari World was also quite cool. As an engineering student, I really appreciated the trusswork porn surrounding me on all sides. I know most enthusiasts at some point entertain the thought of building a woodie model with matches one day, but for a proper challenge, do the Ferrari World dome.
Riding Helix last year was also quite a "wow" moment. The rest of the CF-ers at Liseberg that day had ridden it early in the morning, and assured me that "It was okay, but not top ten or anything". Turned out that:
1) The ride had warmed up a bit over the day. It was late afternoon when I rode it.
2) My measly 25-ish coaster count means that "outside the top 10" for me is a fantastically crappy ride. While many other people might have ridden coasters that give Helix a run for the money, I hadn't, and Helix placed itself among the best ones I've ridden - if not THE best. I had got low-ish expectations, but had them all blown away. That was "wow" indeed.