Regarding wait times...
Depends on if you get stuck at the tapstiles, your pace vs others, and, if at EMH, whether or not you understand which direction you need to go (the latter is what messed my plans for an early FOP ride).
You could be at the very front of the line and still get stuck into an hour wait because of so many variables. When I arrived an hour early, the shortest lines were just reaching the ticket booths. It didn't take too long to get in but not knowing how they split on-site EMH guests and off-site EMH (like Disney Springs guests) slowed our progress and by the time we reached what would have been the end, it was marked as a 3 hour wait. Since we had a fastpass later in the day, we opted to walk on Na'vi instead of risking wasting the entire EMH and then some in that line. Though a lot of you might feel that NRJ is still a waste of time XD