FYI: I shot those panos over a year ago in the winter when it was -10 inside, and there were about 15 other photographers lurking about! I haven't been back since, though I really want to go again. I know the farmer's market doesn't start up again until May, and that is what draws most people to the area. So... though I'm not (publicly) advocating we trespass, but I could check out the area soon enough to see if the places I know are still accessible.
Oh, and another thing: it is not only fairly dark in there but the air is full of caustic particulates (lime). Makes for great light-beams, but really bad for changing lenses or using unsealed N**ons or C**ons.
Though, as with anything, you do it at your own risk...