Leveled my mining long after CRZ implementation. Honestly, I had an easier time leveling my mining than I did during the time they were relevant materials. Could be the epic flying, but I doubt it. Had my addon enabled for herbs too (too lazy to filter), and I encountered tons of them as well. Pre-CRZ I was stuck not ever seeming to find enough Fel Iron Ore, and people be gouging the hell out of their prices.
Also worth noting is I've mined enough of the stuff to level engineering and blacksmithing to cap, and past outland/northrend pieces on a second blacksmith as well.