It really is simple...if my direction-challenged dh can find the DME counter, just about anyone can.
When you get off the tram, from the gate area, walk past security, into the main terminal area. As you can see from duds map, the airport is laid out like a fat X, over on it's side (sort of). Just about the only time I get messed up is when I'm arriving at MCO and having to find my way from level 1 up to level 3 and look for the 'correct' side..either A or B. Somehow I always get turned around. So..last time I spent some extra time just wandering around, trying to get things into my old brain. But, I digress....
When you get to that main terminal area (with all the trees and such), you will see big, neon As and Bs. You want to head to the B side. By the way, you are on level 3 at this point. You will go down, usually by either escalator or stairs, to level 2, baggage claim. I always just hop on the elevators that are right there, in front of me. You can head off to the right and take the next bank of elevators if you wish. When you get to level 1, ground transportation, you will go to the left, with the rental car counters on your right, the outside drive area to your left. You will find the DME all the way down, on the right.
It takes about 8-10 mins to get from the gate to the DME area. It really is simple.