I was looking for this among all the responses. Surprised you're the only one who mentioned it.
In my first job, I would make constant productivity improvements like this. This resulted in two problems:
1. The team became dependent on them, but only I would maintain them (management's directive). Although productivity went up, management saw me as the bottleneck because if the tool acted poorly, that team member's work was held up until I fixed it. I ended up with a lot more responsibilities, yet had to keep up with all my teammates who were using the tool to be more productive. That's a recipe for burnout. And except for one bonus one year, I didn't get paid more and it was made clear to me that all this stuff would not contribute to a promotion.
In summary: I needed to maintain all this, do my "regular" job, and had no option not to work on the tools any more.
2. Since management loved all these tools, they decided to own them: Prioritized features, changed behavior for the worse, etc. I now had to not only maintain my babies, but I had no say on the development of said babies.
I was eventually fired for not being productive enough on my "real" work.[1]
I'm not jaded, though. Now in every new job, I test the waters. If management acts this way again, I stop showing people my productivity tools, and slowly look for another job. Often, management really does appreciate and reward me.
[1] Well, and for other reasons. I quit first, and they retroactively fired me :-)