If you go back and you are in Ontario you can get the health benefits back after 3 months - BUT - you must apply to get them back when you return.
The problem with CCRA (Rev Can) is that they do not define exactly how to be non-resident. They look at each individual case. So, it is possible to kep some things - ie. a bank account if you have a reason for it (ie. investments such as rental properties etc).