There's a BIG difference between Diamond and Gold (besides Diamond Force):
"If you are a Diamond VIP, you’ll enjoy access to the Executive Floor lounge, even if you don’t receive a room upgrade to the Executive Floor, including daily complimentary Continental breakfast."
Gold VIPs only have access to the EL if they received the upgrade.
My family and I spent a month last July in Europe staying at the Paris ADT, Hilton Sorrento, Florence Metropole and Cavalieri. As a Diamond, we did NOT get upgraded to the Executive Floor at the ADT however thanks to Diamond membership we did have access to the EL. Had I been Gold we would have had two complimentary Continental breakfast(s) only. An assured ADT Executive Lounge experience coupled with a glass of champagne sets Diamond apart.