I figured out a work around to keep things saved, so now it makes perfect sense. The speed difference to me is so massive that losing an hours worth of work isn't the end of the world.
It appears a good indication of saving stoping is that the undo command stops working and is continually greyed out. I check for this every so often, much like I would hit command save in previous programs.
At this point I go back and duplicate the project I'm working on. This forces a save. I don't have it duplicate the media etc, I just go with the simplist option, duplicating jthe render files.
At this point you can continue to work, or you can quit and relaunch the program and get your undo command back.
Yes, it's more labourious than hitting command-s. I wish they would just put it back in. But, the speed increases, at least for me, are so big, that having to duplicate my project one an hour make up for it. It's just modifying your old behaviour to hit command-s to hitting undo and hearing it refuse to do it.
I agree, it's total crap that we have to go through this, but for me, the massive speed increase is actually worth it. It'd be nicer if they fixed it through.