We did the same thing... moved from a 98 Dynasty w/8.3 Cummins to a 2012 Ford F53 gasser, and for the same reasons.
1. Do I miss the air bags? Not really. We only drive about 6k miles a year, and we actually were amazed at how it rides.
2. The new F53 engine compartment must be really well insulated. At an idle I can't even tell it's running. Of course, I hear it at speed, but I'm also only paying $70 for oil service and a multi-point inspection as opposed to $400+ for the Cummins.
3. Not only are the F53 brakes amazing, but the torque-shift tranny does an excellent job slowing the coach down.
As I said, we moved from a diesel to a gasser for the same reasons as you and are extremely happy with the move.