They have cut down their hours so if you were trying to catch that 5AM flight, or landing into YYZ after midnight - sorry you are out of luck!
Also, if you are leaving town early in the morning, or coming in after 9-10PM, they no longer send the large coach buses with wifi. You may find yourself squished into a small van with 10 or so other passengers. If you are really unlucky, you may also be left behind if the van is full!
You may think it is fast on the highway from YYZ to downtown, but the traffic once into the downtown core is always terrible and end up taking a long time doing all the drop-offs, especially if you are not for the first or second drop-off location. I always get off at the Sheraton and walk home, but most times it honestly does not take much longer for me on the TTC.
But, like before, most drivers are friendly :)