Oh please! I don't work for NavCanada, and they certainly don't need me to come to their defence. If you took the time to have a tour of a NavCanada facility such as YYZ tower, you would see that they have developed several industry-leading technologies, inculding some that have been sold to other ATC agencies throughout the world.
Have you never heard of spamming? Imagine the gridlock to the ATC system when some hacker with nothing better to do decides to spam the ATC flight planning system with thousands of spam flight plans on a busy Friday afternoon. Meanwhile, folks like yourself, with a need to file a legitimate flight plan, sit waiting for hours for their clearance to come through. The registration program is simply to help prevent such an attack by allowing ATC to limit users to those with a legitimate need.
In other words, instead of slamming NavCanada for having a reasonable security protocol, maybe you should be criticizing fltplan.com and DUATS for not having a similar facility in place.
JMHO