Yea, this thread is outdated and could confuse someone coming here looking for info

Forget the comments about the Mickey Mouse train for connections. It's landside so you don't want to us it for connections.
Ignore the previous posts about an "inter terminal shuttle" as all gates can now be reached without re-clearing security.

There is a modern people mover airside (within the secured area). It's been around for years but only recently been extended to Terminal A. This means it now stops at all terminals.

Terminal A airside used to be split between north/south. It's still split, but a connector walkway has been built so you can get from the south to the north (where the train is) without going thru security again.

Terminal B is like a central building with 4 spokes out to the concourses. It's easy to lose bearings in there. You can walk freely between each of the concourses.

Terminal C has a north & south concourse, though I don't think they're labeled as such. Just follow the signs to you specific gate. IIRC, C-29 and higher is "C-South". Again, no problems walking between north and south.

Terminals D and E are the same complex. D being the 'north' and E the 'south'. You can walk freely between the 2.

Also note terminal E is connected to C-South and D is connected to C-North.
So those 4 form a big square walkway with concourse "fingers". Personally, within those 4, I feel it's best to walk.

The only downside to the (newer) train is that it runs towards the north side of each terminal complex whereas CO operations tend to favor the south side (Terminal A is the exception where CO favors the north).
So it is a little walk to/from the train and C-South or E. I enjoy walking so IMHO it isn't a bad walk, but I can see some folks not liking it.

The train is on top of the terminals. To help find the escalators/elevators, look for flashing blue strobe lights. Walk thru the concourse towards the light, once at the light a turn off the main hallways will lead to the escalators. Study the maps 1st to have an idea where the escalators are and use the blue lights to make sure that you don't miss the turn because of the crowds.