Thanks for all the information, Michelle!
I wanted to clarify that FastPass+ reservations for those staying on-site at a Walt Disney World resort are only available 60 days in advance, not 90. If you want to get reservations for the most popular rides (like "Frozen Ever After" or "Soarin" at Epcot or the "Seven Dwarves Mine Train" at Magic Kingdom), your best chance is to be online making reservations as soon as they open 60 days before your date of arrival.
Secondly, it's worth noting that the Swan and Dolphin resort (our conference hotel) is not technically considered a Disney resort because it's run by Starwood, not Disney (although it's located on land owned by and leased from Disney). That said, guests of the Swan and Dolphin still enjoy some (but not all) of the benefits of staying at a Disney resort.
Here is a list of the benefits included at Swan and Dolphin. The main ones that are not included are free hotel parking, free transportation from the airport on the Disney Magical Express, free MagicBands, and the ability to charge Disney World purchases to your room.
One more thing - dining reservations open 180 days in advance. If you desire to dine at any of the more popular sit-down restaurants in Walt Disney World, make your reservations now. (It's already too late to get some of the most popular ones, but you may get lucky and catch a slot that someone else cancelled so keep trying!)
Josh