I don't know that I'll ever understand this mentality. You're welcome to try and explain it.....
How can the iPhone be boring? Are you staring at the home screen regularly? Are you simply saying the things you use the phone for are boring? I guess perhaps the look of the apps gets old (even though they change as they are updated)?
I just don't get the whole "bored" concept. The smartphone is a tool. We use it to consume media, connect with people and absorb information. The package these things come in is of little concern as one is rarely staring at a home screen.
Now, if there were things about the iPhone that made a task particularly difficult to you, I understand that. But the "I'm bored" reason for moving away from an iPhone just never really made any sense to me.
While I share much of these sentiments, I understand how for many people a smartphone is more than just a tool. In much the same way people enjoy delving into anything they find interesting and customizing, accesorizing, etc, they find it an enjoyable part of their tech as well.
I too found it interesting to tinker with my first few Android devices, seeing what I could change, how I could change or tailor its functionality to better suit my needs or liking for that matter. The luster of this aspect of Android eventually wore off as I found 1) I'd usually just revert back to standard or stock functionality (i.e. It's cool to be able to swipe open an app drawer or perform another swipe to go home, but it's no quicker than just pressing the home button) and 2) I just don't have the time or desire to spend endless hours doing it. But my preferences certainly don't diminish someone else's desire for this ability to tweak and customize. I don't find the value in it that another does. To each their own.