I flew business class from Brisbane to Vienna in 2019. I only chose business so I could have my legs up and not arrive with tree trunks. I was so excited to find I had a separate line through security etc straight to the Emirates lounge where I drank real champagne and ate delectable food until I couldn’t fit in any more. When I boarded the plane from a separate entry straight from the lounge, I thought I’m never flying cattle class again! Like you, once I was in my “seat” I pulled the “mattress” over me and stretched out. The lady ( used to be air hostess) came and explained that was to sleep on not under, so I repositioned myself and fell asleep. I didn’t get the welcome champagne or the dinner but I didn’t care. PS I haven’t been able to afford business class since then 😔