Welcome to the EGGhead Forum - a great place to visit and packed with tips and EGGspert advice! You can also join the conversation and get more information and amazing kamado recipes by following Big Green Egg at:
@Focker that is some good looking grub. My bro in law has one of those grills. His is the same as you describe: regular gas burners with stainless plates with small holes that sit between the burner and the grid. I think CB calls them emitter plates. I was impressed with how it cooked. It has nice even heat across the grid, no flare-ups, good grill marks (like those on your steaks) and cooks fast. I think they basically work the same as a set of GrillGrates. I'm not going back to a gasser anytime soon myself, but for someone interested in a gasser it seems pretty nice.
One downside is he said the emitter plates have to be cleaned often for it to operate correctly because all the small holes get clogged. It takes some elbow grease to get them clean.
If you want to make them on the egg my favorite way is to get a small pan or a sheet of aluminum foil. Use skewers to toast the mellows over a direct fire, build the s'smores, then put them on the pan and close the dome for a little while. This will get the chocolate nice and melted.