Hi Elliott - wow I've never had my own thread before . Yes we went there June 2003 which I think was its first summer opening.
Kids tea was at 5.30 - all kids under 14 (I think) were expected to eat their meal then (possibly a bit tricky if you come from UK and are still an hour out). Dinner for adults was around 7.30/8.00 iirc apart from the evening where you could eat out and the family bbq.
Under 4's were expected to be in bed by 7.30, and not allowed at adult dinner, and baby listening started at 7pm. It consisted of 2 reps listening intermittently at doors and checking inside if they heard a noise. You could leave your own baby monitor with them for constant contact but bear in mind that all the Tomy ones have the same frequencies so interference was a problem. They would babysit the odd child for a short spell but not sure that is normal. There was an evening Cocoa club for older kids (4 and up I think) who would be supervised and watch a video, play games and so on, so ds (then 5) staying up later was fine. dd was 22 months and did not settle well for the first few nights, would climb out of her travel cot and scratch at the door. She did get better though as she got more accustomed to the place but the first couple of evenings we nipped up between courses to check on her. Generally I don't think anyone had a problem getting their kids to bed and that week (not school holiday) there were a number of under 4's.
We used the day time childcare for dd on a casual basis because we had booked last minute through Iglu.com and it wasn't full that week. dd was fine and entertained although I didn't feel the room they used was that great for the number of kids. Naps could be taken either in the nursery in a buggy or travel cot or in your room. the staff seemed well trained, organised and motivated and the kids were happy. The full service wasn't on offer that week, just the nursery, so can't comment on activities for the Sprites etc.
There were a few interconnecting/family rooms in the newer part of the hotel but the standard rooms were a squeeze for 4, especially the bathrooms, and the decor generally had seen better days but may have been improved since.
As far as things to do went there was plenty. Mountain trains, cable cars, walking, outdoor swimming pool, playgrounds, dry toboggan run and mini train were all within easy reach, although bear in mind that you may not want to take small children up to the full altitude of the Aiguille du Midi. The Mer de Glace is spectacular and easily accessible and the ice caves up there worth a visit too. Geneva is only just over an hour a way and that opens up lake trips and a mini train tour through the old town, amongst its attractions. Certainly we found enough to do for a week.
Overall my intial concerns about the whole holiday, especially since we'd got it so cheap, proved unfounded and we would definitely consider it again - summer or winter.
Sorry this has turned into an essay. Hope it helps. If you have any other questions don't hesitate to shout!