Thanks for the responses. Makes me feel "it's not (necessarily) me....."
To add to my original post.....
I usually announce myself ~15 ft. before and typically if it's 2 people jogging together. They are mostly likely talking to each other and actually would hear me. If it's 1 person (who, 99 times out of 100, has on headsets, earbuds, etc.) I usually won't announce unless they are meandering towards the center and/or there is on-coming traffic (like a bike). Because of the width of the lanes, I almost always announce my passing when it's another biker.
Cheers.....