That could well be the one although I remember it being quite a bit narrower than that (it was 3 years ago though). Was certainly a challenge on skis when you’re trying to turn small and not leave the group behind.
As for Chamonix you’d probably love it as boarders. The off piste is is immense and as mentioned above the Grand Montets in Argentiere (10 minute bus ride from Cham) is brilliant.
Queue wise in France I don’t think I’ve ever waited anything near that long (bar Cham) but lift queues can certainly take a good 10 minutes at times and a little longer at weekends. Tignes/Val isn’t bad ‘cos you’re straight on the chairlifts up the mountain but in Cham the whole resort has to take a cable car up to the ski-area which is at best a nightmare!
If you’re still deciding where to go in January I’m off to Flaine 1-9th and will report back on snow conditions/resort etc. Out of interest, anyone else there then? I’ve been told the skiing/boarding is meant to be a little bit on the special side for the better riders, is this right?