So just to report back, getting from C gates to D and vv was very easy. I would say just under 10 minutes from leaving the Centurion lounge to my gate in C. We took a tram from D to C , turned left immediately after the tram, and followed the signs for the other concourses. We ended up taking the moving walkways to our gate. The only issue I could see is if people accidentally leave the secure area after the tram from D. I could see someone not paying attention and walking down towards baggage claim.

The lounge was packed, but drinks and food were good and beat the terminal....which was a zoo! Thanks again for the help.