No it's not. I've come across at least 3 SSIDs. There are at least two at the resorts, I room guest and public area. There is a different SSID at the Parks, Disney a Guest, and I feel like there is another one there.
The thing is as long as your device is set to use DHCP ( it pretty much had to be) it will connect to the network it sees after you have made the initial connection. It will do it automatically for the rest of your trip.
To the OP, there is nothing to setup and no password required for any of the networks.