If your food is with you at all times, at least the bear won't be getting rewarded for messing with a tent/pack. I personally would be nervous on the off chance that a curious bear wanted to investigate, but every bear I have encountered in the Cascades has been easily scared off.
I have spent/spend plenty of time in the Cascades, and no, I have not had any real bear issues. I still think it is worth it to properly store my food. It isn't that big of an inconvenience. With the growing interest in hiking and backpacking, it won't take too long for bears in the Cascades to start acting like bears in the Sierra. Before Yosemite Valley was an amusement park, the bears in that area were probably just like the bears in Cascades.