There will definitely be several somebodies at MCO who will be able to direct you to the right place. There are usually three to five at the
DCL stand just inside the main terminal. They are spectacularly well-organized, and have passenger lists for every cruiser and land/sea guest arriving. Just stomp right up to them, tell them who you are, and they'll mark you off their list. In our experience, you've generally got enough time to use the facilities and grab a beverage, if necessary. Once they've rounded up six or eight guests, they'll gather everybody up and head toward the Disney bus area.
There are additional CMs there who will help with the Disney Sorting Ceremony. There are separate lines for the MK resorts, the Epcot resorts, and those going directly to the ship.
Now, the thing I don't think any of us know is how or if this is going to change once they start that new WDW luggage and transportation program in May. My best guess is that there'll be separate stands for DCL guests and WDW guests. But I guess we'll find out in May.
In the meantime, my best advice would be that once you see the DCL folks there at the terminal, just relax and let the Mouse do all the work.