As a forester working on Vancouver Island, I have bear encounters on an almost daily basis. I carry bear spray, but not for the Black Bears, but for the Cougars. As long as you don't surprise a bear, or get between a mom and cubs, you're fine. I find that it's rare to even see bears when you are hiking on a trail in groups, talking etc.
If you are in Grizzly country, well that's another matter. Most Foresters working on the central coast of BC carry shot guns instead of Bear spray. Most for those of you in the USA, there ain't many Grizzlies down there to worry about.
BTW, have you ever tried firing off a can of bear spray? It has a range of 5 to 6 feet. Something to keep in mind