Hi Renate!
Good thinking and great questions - its always good to keep the leg circulation going whenever possible.
Disney is a great place for Guests with
limited mobility. If Guests traveling in ECVs prefer to stand in line, typically they leave their ECVs in stroller parking areas located nearest to the attraction. If there isn't stroller parking near the attraction, you can ask any Cast Member in the area who will direct you to the safest place to leave them.
For those attractions where they would like to remain in their ECVs in the queues, a Cast Member will direct them where to park it just prior to boarding. If there is an attraction where the unloading area is different, Cast Members will move them while on they are on the attraction so its available to them when they get off.
A lot of the queues at Disney World are wide enough to accommodate wheelchairs and ECVs. Disney now has a new system for queues that aren't accessible. If there are queues that require Guests in wheelchairs or ECVs to enter through alternate queues, they should see a Cast Member at that attraction for assistance. They will give them and the members of their party a return time to come back to the attraction based on the current wait time to enter through an alternate entrance.
Wishing you minnie magical memories :-) Allison V.