FWIW, I have friends who had shifts and are front line at Disney and being treated pretty well so far. Disney is using the MK Tunnels as a bunker and letting CMs stay the night if they want and free food from the cast cafeteria.
But yeah, Universal is much better than Disney when it comes to caring about employees. As far as verging on slavery... i'd say the only thing Disney does that verges on it is the College Program. You're the lowest of the low, you do the most work, and you get disrespected more than anyone else simply because you're on that program.