So it's your waiting area for the Megabus. By the way, you can't wait outside at the bus stop, the lineup actually starts in the building. If you aren't aware of that, you'd be forced to the back of the line.
I took the 9:00pm bus last night heading back to Toronto, and surprisingly only about 20 people on board. Definitely a lot more comfortable than the 12:30am midnight bus from Toronto, which was full right to every single seat.
I do agree with Jennifer K., which is that there's not a lot of amenities around the waiting area. You could go inside Le 1000 if the shops are still open, or through the Reso to the Eaton Centre food court for food.