Canada and the USA do NOT have a EU-like or a Australia-New Zealand like arrangement in terms of freedom of movement. There is a so-called TN visa for Canadian citizens, but that's a non-immigrant visa and not everyone can use it.It's not about you, almost everyone in this forum once they get there citizneship they want move south literally the next day.
canada is bringing half million immigrants each year that want go south at this rate there will be more immigrants from Canada going to the US than people from mexico.
that's why a VISA wil be necessary to stop this influx of canadians to the US.
anyway enjoy while it last you are free now.
What I hope is for Canada to join the EU.