I agree with Testtrack, although the ride system for Soarin may not be that complicated or thrilling, the attraction is truly one of the best I have experienced. The peacefulness of gliding through the air over majestic natural wonders and human achievements combined with the Jerry Goldsmith score, motion base effects, and scents creates an experience that takes you someplace else (exactly what Disney aims to do). The attraction will not terrify anyone due to scares (only those fearful of heights or prone to motion sickness) and has a low height requirement of 40" (it really could have no height requirement if they devised a new restraint system, but part of the experience is the freedom on the lapbelt only restraints sidenote: according to the Center for Disease control over 50% of 4 year olds are 40in in height.)
If you are looking for out of this world thrills you will be disappointed, if you want one of the most peaceful, relaxing, enjoyable experiences in WDW you won't want to ever leave the Land again.