Upvote:5
Val Thorens has multiple moving carpets: Castor and Pollux, Musaraigne and Campagnols. Free, and easy for small kids. Roc is a small draglift, so less suitable.
http://www.valthorensguide.co.uk/beginners-area.html
In the next valley there's Courchevel 1850, which has three longer lifts: Cospillot, Bellecote, and Etoiles.
http://www.courchnet.com/lifts/ski/options.html
Apparently the free lift in Val Claret isn't that nice either for young kids, so Tignes-le-Lac might be a better option.
http://www.telegraph.co.uk/travel/snowandski/france/tignes/6762169/Tignes-piste-guide.html