I *promise* you will be fine! Take your time, go at a speed that feels safe and comfortable to you.
What happens is that we naturally will lean "against" the slope as we go up or down; it's something our bodies do instinctively to help keep our center of gravity in the proper place. So you will find that you tend to lean forward when going up, and lean back a bit when going down.
But honestly, after you go up and down once, you probably won't worry about it too much! And if you are just determined to avoid those ramps, you can always take the ferry boat over to TTC, and catch the Monorail there!