I think you'd have an easier time with this argument if people were given an air conditioned room to wait in and do nothing else except play on their phone or watch Disney movies. Instead they often ride other rides (in the regular queue or via G+), go watch a show, etc. So while yes you're actually waiting an amount of time, the system allows you to double dip, effectively getting twice as much done as someone just in a standby queue. This is one of the reasons that the majority of people using it were doing so for convenience, not for a disability which made it impossible for them to wait in a standby queue.