I thought T5 was marvellous.
Light and airy and everything was very quick. I didn't wait around anywhere for more than a few seconds - definitely the best airport I have visited.
I wish I could say the same about the flights. Very old tatty plane (G-BUSJ) which made an insanely loud buzzing noise throughout the entire journey - both ways.
It seemed like a heavy vibration from the right hand side and varied with engine power. Wishful thinking led me to expect that the noise would die down once we had reached cruise height but this was not to be. The only time the noise went away was when we were descending.
We flew with BA as an 'upgrade' from Easyjet who we last flew to Milan with and won't bother doing that again! Admittedly, the airport experience was better but it's a hell of a premium to pay for basically a sandwich, a coffee and a couple of inches extra legroom.
Steve