Actually, don't worry too much!! Sometimes when I read these type threads, then go to Disney, I wonder if we're talking about the same place! Maybe our good luck, but we've only had one breakdown while in line in the many years we have been going - Frozen. Have seen a few others at various times that were closed when we went by.
We never go at super busy times, or any holidays, which may make a difference - don't know. The same with transportation - no issues here. Service while dining - no problems. Maybe we have
following us around.