I was there for 3 days in the beginning of March. I spent 90% of my time on Blackcomb and still didn't get to see (not ride, but see even at a distance) the entire Blackcomb side. I gotta say 7th heaven was such a blast to tool around with fresh powder. There were some flat spots in the trees though, and the heavy powder didn't make it any easier. I found skier's right of 7th heaven to be a little steeper, so I would stick to that side to avoid flats. One other thing I learned quickly at the 7th heaven chair was to enter it from the cat track side, which tends to be a shorter line.
There is a section between Heavenly Basin and Overbite where a cliff is waiting for you once you go down through the trees for a bit. It's not marked off or anything, but thankfully the trees were too crowded that I had to go slow enough to notice the darn cliff. I had to unstrap and traverse my way out of that one. The trees were probably a natural barrier, but man, I've never come close to a cliff like that ever. It's just amazing to me that this kind of terrain was everywhere in-bounds. Will definitely be back there in the future.