I've noticed the overuse of "the" in books, blogs, and forums, and even in my own writing, here and there. So I've done my best to keep a sharp eye for any such irritating repetitions in my writing. I know I'll still miss them now and again, even though I make a special effort to spot them during my final edits. This is why it's so important to have good beta readers and editors.
I guess it's about how we read our own writing -- the mind sees what it expects to see, and it often misses what it should see.