I don't get the mentality of sending out thousands of resumes. I sent out one to get my current job because I wanted to work there.
Most of the jobs I've applied for after I've graduated college, I was able to get at least an in person interview, and several times, was able to juggle between several offers; I've only applied to roughly five or six jobs in my whole career so far. Why? Because I actually took the time to look at their website, see if it was something I was interested in, and even come up with work-related questions that I could ask them in my cover letter.
Though, I would still say that it's a numbers game, but you still have to make a decent effort for each job you apply for. It's almost like dating, in a way.
This alone suggests you were in a somewhat different situation than that of the author. Resume carpet-bombing is what people seem to eventually do when they aren't getting offers.
[1] Note that that "reason" was no doubt due to my inexperience and not knowing how to properly market myself at the time.
Just another indicator not to take job hunt too personal and making sure to look into every opportunity available.
Actually I wouldn't, but my situation is probably different than most people just looking for a job. I wouldn't let it get to weeks of silence. I'd just move on.