This explains why the ride seemed so lackluster when I rode it last year.
The first time I rode SM was in 2001 when I was 16. My sisters and I waited what felt like 2 hours to go on the ride. When I stepped off the coaster, I remember feeling like those 2 hours were totally worth it. SM was one of the most thrilling coasters I had ever been on with the special effects, speed and smoothness of the ride.
Flash forward to 2015, my second time riding it. This time as a 30 year old and by myself. Also I had a FP for it so no 2 hour wait this time. I was feeling especially lucky as I scored the first car this time. As I was secured in my seat, my heart began to beat faster with anticipation and excitement. Soon, I was being hoisted up that initial incline with the strobe lights. Then, when the ride kicked into gear, I couldn't help but wonder if the ride was missing one (a gear that is). The first thing I noticed was the ride was not really going particularly fast and the special effects were functioning but the lack of speed was diluting their effectiveness. Next, I noticed how jerky the ride felt as we rounded corners. I felt like I was being thrown around a bit, which certainly was not a part of my first go-around. On top of all of this, I noticed they had left some of the services lights on which also took away from some of the experience.
As I departed, I was feeling like it wasn't as spectacular as I remembered it in addition to feeling a little sore. Now it makes sense why my second time riding SM left me wanting more (if Tirian's information is correct).