You will have to take the monorail from the gates to the main terminal. It's not that bad of a walk. It will get you started for all the walking you will do in the parks.
I have always seen (and been extremely jealous of!!!) the Disney Cruise Line CM's standing just inside the main area of the terminal, welcoming those going on the cruise. I wonder if this is the area we will be going to in order to be directed to DME. Any thoughts??
From what my TA told me CMs will be there to greet people using ME and show them to a private room where they will wait for the bus they are scheduled to take.