A laptop computer can be taken into the parks.
BUT (as you said) I think that would only be on SELECTED resort changing days.
For example, if the resort changing day was on the 5th Wednesday of the month, the laptop might need to be powered off during the passage under Spaceship Earth.
Likewise, if the laptop had been used for email the previous morning, you might want to respond to the newest files before riding M:S that day (or at least sometime after).
A laptop can actually be an asset if you are picking up FP for Soarin'... use it like a freelow, and your return time can be reduced or extended by a similar amount.
The thing to remember is, if you were leaving BVC and checking into Pop, the situation might be slightly reversed and there MIGHT be the need to counterflange the hydroturbofram, but anyone with a laptop would already know this.
You can check out more interesting techniques my upcoming book, "How to Carry a Laptop Through Epcot on Resort Changing Day; Fantasy or Myth" as soon as I write it.