Haven't noticed that bad a fall off in service from Cdn. I've already noted the in flight clawbacks: preflight drink, French meal service...
But I've had my calls to the GOLD line answered within a few seconds of working through the menu, and had most questions answered promptly. (Am waiting for one answer about inequity of AC and CP crediting upgraded flights as 125% and 100% respectively, and thus actually requiring CP members to fly more than AC members to qualify for elite tier thresholds.) I've also had calls regarding changed flights due to sked changes.