I would rather have made this as a comment to Jillian Page's Patent Pending, but there didn't seem to be any opportunity on her site.
In her post she very clearly spells out the issues in a balanced fashion. In Ontario, especially in the larger centers it is becoming more common to have a single occupancy washroom labeled 'disabled' or sometimes 'family'. In either case they are larger, and afford privacy, and security. It is starting to become more common in business settings where two washrooms are single use and used to be labeled male and female to see the signs coming down. Two single washrooms then become available for people (what a concept!).
If you are visiting Toronto, I would recommend (for wonderful food as well) Le Papillon on Front, a downtown eatery specializing in Quebecois fare. The atmosphere is inviting, and the very pleasant surprise, a row of unisex washrooms. There are no common male/female washrooms to be seen. A very civilized dining experience all round.
Apologies to other restaurants that have picked up on the same clearly superior (albeit expensive) solution.
Perhaps a listing by city of businesses that offer single use unisex washrooms should be created.