A live update from the Al Reem lounge :
Virgin SG + partner, travelling SYD-AUH-CDG
Leaving Sydney, we had no problem getting into the Etihad first/business class lounge, which was fantastic and not crowded at all (there were a few empty seats on the plane too)
At Abu Dhabi we arrive and depart from terminal 3, so we took the 15 minute walk through a very relaxed security Xray to the Al Reem lounge in terminal 1. The lounge isn't nearly as big as it looks in the pictures but right now (midnight), it's not crowded, with a similar level of service and amenities to the Virgin lounges in australia. The lady at the desk promised us it's only 15 minutes back to our gate, although my previous experiences at this airport have been really bad (a friend missed their connecting flight last year). It doesn't look very crowded out there, so we're going to believe her. I guess I'll be back here in a couple of hours if she was wrong.
So i'm also optimistic about the CDG lounge when we leave Paris.
PS thanks to everyone who's contributed to these threads, it helps.