I just came back from whistler last week. And OMG its amazing. BUT, if you went below the alpine it was basically all ice.
7th heaven was all super deep powder, All the back bowls on whistler was super deep pow too. Thats the symphony chair, that area was basically epic. The other great chair was harmony and then also the peak express. Take those 3 chairs and you will have powder all day. I am so spoiled now lol.