This is really all so new that each day you might experience something different. We experienced all of the following:
AM
1) our bands were pre-scanned before getting to Mickey turnstiles to then scan again, looser flow, floating cm's
2) scanned at Mickey head then 1 person in group scanned again just inside to confirm resort
3) roped off line (very long) to pre-scan before entering the large queue area to wait & scan at Mickey head at opening time, mentioned to family that I did not allow for this much wait time just to enter park
PM
1) scanned bands prior to entering each line, sometimes the line to scan was the line for the ride, so once scanned the wait time was less than 5 minutes, this is going to be a problem for fast loading rides if the band scanning is the limiting factor
2) long scan lines had a cm "looking" for bands just to keep you for waiting 15 minutes just to be denied entry, but ultimately you were scanned
3) no scanning whatsoever, there were so few people at the park one night (or I should say early morning) that there was no need to scan there was no wait on any ride, on the other hand I also suspected the entire scanning system may have been down and that's why the scanners disappeared as the night wore on and crowds thinned
I would say be prepared for any new manifestation of the emh program.