I'm just going to design based off of how to get from the new Mickey and Friends/Pinocchio combo to the esplanade (since I think all other parking structures right now are hypothetical). So decide around 17,000 vehicles between the two of them. Common multiplier of three people per vehicle (industry standard). Take Darkbeer's 20% surge condition (I don't know where he gets that number, but let's go with it)....and you get 10,200 people per hour.
- At that number, the monorail is a non-starter*
- The current parking tram system is basically not functional.
Both the monorail and the parking tram suffer from the same problem, which is that the vehicle has to stop while boarding.
So now you're going for a system that constantly moves:
- A top of the line 3s gondola gets a published spec of around 5,000 people per hour (
Citation Link)
Not bad, but not ideal and seems a bit like overkill for 3/4's of a mile. At such short distances and with such a high capacity, the winner seems to be....
- A moving walkway! at 8,200 people per hour (
Citation Link)
This is damn near the best that I could find. It's probably the best decision, which is why everyone from Disneyland Paris to Universal Orlando uses them. Essentially two moving walkways would do the job. The problem with moving walkways, of course, is that Disney would have to build a right-of-way from the Mickey/Pinocchio to the Esplanade. Do they bridge it the whole way (really expensive), do they leave it at ground level (how do guests cross the street?). The cheapest way would probably be to eliminate the trams and put moving walkways along the tram route.
If people complain that they have to walk/stand the length of the moving walkway (people complaining about 3/4's of a mile is just the funniest thing to me) to which I have an equally funny solution: Disney will provide folding chairs at the beginning of the route and when you get on the moving walkway, you can simply plop down your folding chair on the right side of the conveyer belt and ride your way to the end, at which point you re-fold the chair and give it back to a Disney employee who will ride it back to the front. Problem solved.
*Personal opinion: the monorail is a stupid, outdated way of moving people and I don't know why anybody, from airports to Las Vegas to Disney, would continue building them. As BLo suggested, you could build a gondola system or aerial tramway that moves the same amount of people with a simpler to maintain system at a fraction of the cost. Mainly because there's no need to construct heavy concrete pillars and concrete spans so high in the sky if a cable will do the job.