Attention fellow Torontonians, here are a few easy ways to avoid paying the fare at your new fare gates (hope someone from the TTC reads this).
My experience comes from Stockholm, Sweden, where similar fare gates have been in place for several years now, and the Swedes have become experts at tricking them.
The most common methods are:
(1) Sneaking in through the gate directly behind a person who pays their fare (the gate will not immediately close as long as the sensors detect a person);
(2) Thanks to not having a tap-off requirement yet, you can throw a piece of clothing (e.g. a sweater or a coat) over the gate to trick the sensors on the opposite side into thinking someone is trying to exit (I can see this becoming a problem at unmanned entrances).
Here's a video from a Swedish organization devoted to fare evasion, demonstrating these methods. The only difference is, in Stockholm their gates open sideways (doors go into the gates), ours will open inwards and outwards. This however is irrelevent, as the sensors function the same way. Enjoy!
Stockholm has had a very hard time combatting these methods. They have added a loud alarm and strobe lights at the gates if they are held open for too long, and it is common to see fare enforcement at the fare lines downtown, at the top of escalator banks, and on-board subway trains. But aside from that, there isn't much they can do. It doesn't help the same organization that made the video will pay your fare evasion fines, if you pay them a small monthly fee (about $15 CAD).
I'm not advocating fare evasion, just showing what the TTC can expect once these new fare gates are widely implemented.