Originally posted by Jestocost
Basically, all of the options cited are available for getting your boarding passes with an e-ticket. If you have luggage to check, curbside check in is the easiest, but you also can just go to the counter or, in some cases, use the self-service kiosks. Printing your own boarding passes from the Web site isn't really a timesaver if you have luggage to check, so I wouldn't even consider that as an option.
If there's no luggage to check, my experience is that the self-service kiosks are great, but you also can use the main counters if you prefer face-to-face interaction. Online boarding passes are great for this too, but certainly not worth hauling yourself all around WDW to get.
You should have a copy of your e-ticket receipt (not just your itinerary) available, but usually it's not needed. If you have tickets under multiple record locator numbers and/or members of your party have tickets under different last names, you'll probably want to point that out to ensure that you get boarding passes for everyone. Again, usually not an issue but something to be prepared for just in case.