A colleague I just flew with commutes to LAX. He says that it usually isn't a problem getting a seat, with the triple daily. However, there have been occasions where he has had to get a crew seat (as in cabin crew, not jump seat), and that is quite nasty for a transpac flight. However, if you really needed to go to work, there are quite a few options.
He says that it really isn't a problem. But then, he doesn't commute after every flight, as he does also rent a small place in HK.