Another vote for "do not miss"!!
We got to ride it twice when we were there first of May. On Monday morning it was early entry at Epcot. We were scheduled to do the Segway at 9:30, thanks to great Disney bus transportation, we arrived early, and got to walk on Soarin' before 9:00. This was May 2, before the "official" opening, don't know if that makes a difference.
It is really great, and good for all folks.