Do you run a free software focused system like GNU/Linux? They're much more scriptable than OS X and Windows because (1) a lot of programs embrace the Unix interoperability conventions and (2) free software means that if someone felt that a program's scripting facilities are lacking they can submit a patch.
Even if you don't, I assume that you are a programmer based on context and your comment, which means that the applications you use were designed for people who know how to program and therefore are more likely to be interested in scripting. Also, as a programmer, you're more likely to be using a lot of free software tools even if you're not running a libre system.
Take iTunes for instance. On Windows I'm under the impression that it's not at all scriptable. On OS X there's AppleScript, but it's somewhat underpowered (I remember back in my Apple days I tried scripting it and found that some metadata fields were inaccessible from AppleScript, namely Album Artist. It's also woefully underdocumented.
Windows has Powershell which has an amazing level of power in a system. Everything is an object, everything has properties that can be manipulated. I don't look after Windows infrastructure at all, but people I know who do rave about the level of control they get, and some of the stuff they do makes me jealous.
My understanding is that the GUIs for Exchange etc have essentially changed to being skins on top of it and that's one of the changes that is allowing Microsoft to start promoting GUI-less versions of Windows for cloud servers etc.
Why do people keep bringing up mobile devices like it is some kind of trump card? If you really want to script a mobile device, install whatever Linux distro you want on an Android phone and go to town. Congratulation, you just created a tiny under powered laptop with a shitty screen and an even shittier keyboard.
A smartphone is for checking the weather, reading, looking up places to eat, movies, requesting an Uber or figuring out what bus is coming next, and so on. If you're not using your smartphone for that stuff and instead are scripting your music collection, why even leave your house? Just stay at home and use a computer.
Even if you don't, I assume that you are a programmer based on context and your comment, which means that the applications you use were designed for people who know how to program and therefore are more likely to be interested in scripting. Also, as a programmer, you're more likely to be using a lot of free software tools even if you're not running a libre system.
Take iTunes for instance. On Windows I'm under the impression that it's not at all scriptable. On OS X there's AppleScript, but it's somewhat underpowered (I remember back in my Apple days I tried scripting it and found that some metadata fields were inaccessible from AppleScript, namely Album Artist. It's also woefully underdocumented.