This is quite a bit more substantial than we recall of the RPC's offerings when we used to stay there, last time Christmas 2015.
It was more strictly a continental breakfast then, lavish, but with no hot dishes except oatmeal.
The RPC always used to have much more variety than the other Deluxes' CLs. We were pretty disappointed by WL's CL when we stayed there. None of the beautifully molded butter balls, only a couple ordinary sweet rolls, a bagel or two and a muffin whereas the RPC always had 2-3 varieties of fresh, sliced bread besides plain croissants, various bagels and 3-4 different pastries along with muffins. Nothing like cold cuts and cheese slices with deli salads at WL either.
And the GF CL concierge service is wonderful. We had to leave the MK to get to an Epcot lunch ADR on Christmas Day too quickly to get through the line at MK package pickup. Of course, the MK closed until late afternoon when we were getting ready for dinner. We were leaving next morning so appealed to CL concierge for help in getting the package we'd had to leave in MK. They sent a courier in to retrieve it, who delivered it to our room with a lovely note wishing us a Happy New Year and safe travel home.
THAT'S why an RPC stay is sooooo very worth its cost as the OP likely recalls.