225SG
I'm sorry to hear about your first J trip on EK. I catch this often (and in fact catching it tonite with the entire family).
I've never had a problem with Chauffeur drive - and they always confirm sometime late in the afternoon (or at least an hour or 2 prior to pick-up).
When you checked in, did the agent not give you a lounge invite card, which had the directions on the lounge printed on the back? I suppose I take it for granted as I have been going there for nearly 2-years and reckon I could find the place blindfolded.
I actually find the seats on the 777 better than the A380 - but I know a lot of is down to personal preference.
I hope you give EK another chance...(and agree re your comment on the lounge staff - the girls in SIN are fantastic).