I used to over cook my images when I was learning about HDR, but after a while, it got old. Here are some reasons I can come up with:
1. It's really predictable, and predictability gets boring fast. HDR softwares often provides a certain style of processing, and most people will tend to stick to a preferred style. At first you may find the style interesting, but after a while, you realize it makes all of your images look the same. So why even try? You already know how it will turn out!
2. It's no longer challenging. A part of photography is its technicality. For example, to be able to over come difficult lighting conditions to bring the most out of a shot. HDR kinda takes that away. I remembered thinking "heck, I'm just gonna take 9 exposures and it's gonna be fine". Back then, my unhealthy assumption was because of HDR softwares. It's like a cure for all badly taken images. Now I still take multiple exposures when I come across a tricky lighting condition, but I no longer rely on HDR softwares to get what I want. I compose them manually to make the decision on exactly how I want the final image to look. Often, it looks way more natural than what HDR softwares can give me.
3. HDR software makes my images more "noisy" than it should be. No need to explain this further.
4. I now have learned to embrace natural light more than before.
5. I use the D700 and already I am good with the dynamic range it gives me. I can't imagine how much more I can get out of a D610 or D800. So HDR software kinda becomes less meaningful.
I have more fun with panoramic photos than HDR now especially with landscape photos. No longer am I bound by my lens capability, or even the MP of my image sensor. It actually requires more photoshop skills to make a good pano image and of course, a lot more patience.