Ah, the Toronto Island Ferry. You're still the best way to get to the island.
The only terrible thing about this ferry is the insane lineups to buy tickets and the dearth of seating in the waiting area (not for me, but for all the seniors that are heading to a picnic on the island). One of these things is easily remedied. How? ADVANCE TICKETS!!! This is my best tip for you. At the very very front counter, hidden away on the right, there is a spot to buy advance tickets. These NEVER EXPIRE. If you buy 10 at a time, you get 10% off. Then you get to walk past the insane lineup next time, put in your ticket (which is basically a raffle ticket. Try not to lose it.) and wait for the ferry. Classic example of how a little forethought will keep you from a ton of grief later on.