As a cyclist in vancouver I would say separated infrastructure is a mixed bag, I would have a car cutting me off (right hook as they say), many near misses when I had right of way several times a week on the dunsmuir bike path. I felt a lot safer biking in traffic in that area. OTOH I've enjoyed biking along the skytrain paths all the way out to surrey on occasion. The areas where the segregated path meet traffic have to be very carefully thought out.