hopefully this little bit about e-rides i copied from allears.net will help
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What is a Magic Kingdom E-Ride Night?
A Magic Kingdom E-Ride Night is a special after hours (hard-ticketed) event held on selected nights at the Magic Kingdom.
The great thing about a Magic Kingdom E-Ride Night is that ticket sales are very limited (rumors say about 5,000). (To put that in perspective, a slow day at the Magic Kingdom nets about 25,000 visitors.) The park will remain open 3 hours after its stated closing time for you to enjoy the E-Ticket Rides.
For $12.72 with tax per Adult per night, and $10.60 with tax per Child 3-9 per night, you will be able to enjoy the MK's E-Ticket attractions with super short waits.
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i am lucky enough on our july vacation to have 5 nights where we can use e-ride tickets. we plan on taking advantage of enjoying MK with substantially smaller crowds.
riding all of the favorite rides that may have too long lines during the day and taking many many pictures without the crowds.
i am also just looking to stroll around MK with my DW and experience the joy that MK is without the usual massive july crowds