I maintain that Alpe d' Huez is one of the best MTFs in cycling. You often climb big mammoths beforehand which makes the riders tired in the bottom of Alpe d' Huez. Its basically the perfect finishing climb, 13-14 km is long enough to create good gaps, but the kicker is its steepest in the bottom. Sure, there's a decent amount of valley from Galibier or Croix de Fer (or Ornon, if you want an easier MTF), but the purpose of these climbs beforehand isn't necessarily to make the GC-riders attack on them, rather just tire them out which means the Alpe will be much more selective.
Funny story, I rode the Alpe at 55 min 2 days before La Marmotte in a small race, basically just a Alpe d' Huez TT. I finished 2 minutes down on my friend. 2 days after, I climbed Alpe in 1.25 min and finished almost an hour down on him. Thats why Val Thorens was so shitty as it was, for example, at why Alpe d' Huez can be brutal if the climbs beforehand are climbed relatively hard.