Good post, Weags. However, one distinction that's seldom made is the difference between how HDR is approached by already accomplished photographers and those just learning the craft.
Experienced photogs were often shooting for extended dynamic range for years, sometimes decades. The advent of digital HDR just made it easier, more automatic and repeatable. It became a useful tool, but far from the only one.
It's a different story for those just starting out in photography. Newbies, in general, would like to produce distinctive photographs. The Internet, and forums like TPF in particular, bombard said newbies with many beautiful and distinctive images, giving them a lot to aspire to. So, what often happens is at a stage when they still haven't mastered composition, lighting and the technical elements of 'straight' photography, and once they've learned about this thing called HDR, many latch onto it because they think it gives their photos the distinctiveness that they covet.
Often, it's not even HDR that's being used, but simply tonemapping. Unfortunately, those beginning photographers don't yet realize that grungy and overprocessed images have pretty much seen their day, which is why they often encounter so much resistance to their images; and often blame the critic, imagining a host of sinister motives. The truth is that the "HDR look" is no longer distinctive. With rare exceptions, their images become more about the process than the picture. In truth, the best HDR images are those where its use is virtually invisible, having no real 'look' at all beyond getting a bit closer to visual perfection.
This is why the "HDR Hole" is so aptly named. It's so easy to become addicted to making images that look distinctive, but only to learn later that they're just one of the crowd; blaming those who criticize their work for what it often is, a shortcut to making what they think are 'artsy' images. Eventually, everyone climbs out of the 'hole' after a few months or years, and they have hopefully learned something about photography while down there.