@zersiax @simon On this most recent trip:
When departing from Mexico City on a business class ticket, they automatically suggested the premium lounge, took us straight there after security, left us in the hands of the lounge staff, and returned bang on time to pick us up so we could be some of the first passengers boarding.
When returning from Heathrow on a premium economy ticket, there was no included lounge access so it's impossible to say how they would've handled it, but we did feel more like anonymous cases in their system.
They got us through security extremely efficiently, and asked if we wanted to grab a coffee or something. But we were then just left in the waiting area for over an hour, before being rushed onto a buggy with other passengers. If we'd needed to use the bathroom or something, we would've been out of luck.
After dropping the other passengers off at their gates, there was only about 15 minutes before the scheduled takeoff time. They had already boarded five groups of passengers and we were some of the last people to get on the plane.
So... it could've been worse— we could've missed the flight, for example. But it could've also been a lot better.