Couple of thoughts...kind of a big difference if you start at the top of HG as opposed to say, the bottom of HG. 20 minutes sounds really, really fast to me. I think the last time I did it, it was closer to 35 minutes (I was with my kids).
Takes me about 20-25ish (and I usually consider myself on the slower side as I stop a lot on the uphill parts).
As to those that want it open vs. those that don't mind the hike...I'm all for it opening (this weekend when I will be up there). Under normal circumstances, at best, I might hike the ridge once. On a good day I will spend the whole day lapping the CR pod via the lift. Not exactly the same.
The most I've ever done via the lift is maybe 3 runs in a row at CR. Conditions would have to be incredible or there would have to be no one there for me to lap it more than that with all the other terrain to ski. Hard for me to justify waiting in line at CR otherwise. As for hiking the ridge, I've done it twice in a day but never more than that. Again, usually too much other terrain I want to ski.