"Why would you find other non-software types of engineering boring?"
To do for a living, not casually as you describe. I also am fascinated with how these things work, and frequently look up or watch shows (e.g. How It's Made) on them. That's different from being a mechanical engineer, which is about running software to manipulate 3D models, trying to figure out how to cram everything into a space too small.
Though frankly even my interest only goes so far. For example, I've never looked up in detail how jet planes work. I understand the basic physics of jet engines, but more than that isn't particularly interesting as it doesn't add significantly to my understanding. In other words, I've seen young mechanical engineers get into cars and how internal combustion works. I just understand the basics, but it's more than enough for my purposes.