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Dont think I've ever seen it enforced anywhere and I'd be surpriised if they were.
Don't know about Alpes D'Huez, but spent a few days in the three valleys (Meribel, Courcheval etc) in August last year and nobody gave a monkeys what anyone was or wasn't wearing. Load bike onto chair/Gondola, go up hill, get off and ride down hill again. This also applied to Tignes and Les Arcs.
The runs in those areas were a lot easier than I expected. To clarify, they could be very hard if you wanted to ride them very fast, but if you wanted to pootle they were all rideable/rollable. This applied to the reds. Not sure if this helps, but I'm not convinced that the French would be particular in enforcing the FF rule.
With regards to taking FF on Easyjet, me and my mate just attached them to our cabin baggage rucksacks and nobody said a word. Be aware though that they enforce the bike bag weight limit at Geneva. I had to repack and dispose of a couple of unnecessary items...
My riding in the Alps started 5 years ago in Les Deux Alpes across the road, at which point I was suited up and well in to DH.
I now ride A 6" Enduro bike and go with open face and knee pads and ride the same trails as I did on the Dh with full face and Armour.
I have also rode at Chatel/Morzine, In lightweight gear.
There are green runs at ADH and LDA that you see people on hardtail's on.
As far as I now, the level of safety gear you wear is up to you!