I'm afraid that about sums it up, unless by late night you mean 11:00 at night. Much better MP options elsewhere - I've even done the drive into TO late night if the urge REALLY gets hold of me (places like SRM and C2M are open til 4 AM).
I believe that 400 Speedvale is open later, as well as the "Holistic Centre" just outside Kitchener on #7. I've been told they're open until 1 or 2 am most nights.