I work at a small web development company, and we use no dependency management whatsoever at the frontend side. External libraries are simply downloaded and pasted into the lib folder of whatever website needs them, and our own libraries are happily copy-pasted. All websites are built on ASP.NET MVC.
Recently I was asked to see if frontend package managers like npm and bower were useful for us, mainly because those are terms that you encounter often nowadays when you're searching online for javascript libraries and such.
So I went and read a lot of articles on npm, bower, grunt, gulp, yeo and many more, and I started experimenting with them in a test web application. But after following a few tutorials, I felt that I was spending a lot of time on things that Visual Studio and ASP.NET MVC already did for me, like bundling scripts and minification. There was a lot of new syntax I had to learn, even though I still had no idea what the point of it all was. It felt like I was adding a whole bunch of configuration in what felt like a clunky way just to make updating frontend libraries is slightly easier. I struggled with Gulp/Grunt the most; I simply could not think of anything that I wanted to do with it, that I couldn't do already.
So the actual question is this: Why would I want to use things like bower and gulp in an ASP.NET MVC environment? What problems are they solving, besides making library updates slightly faster? We don't really feel the urge to update our libraries daily; many of our sites run on pretty old jquery versions, and run fine. An I missing something completely, or are we simply not the intended audience for these systems?
I am sorry if this has been asked before or is common knowledge, but I couldn't find it anywhere. For example, if you search online for 'bower + ASP.NET', you will get plenty of articles on how to use them, but hardly any that touch the why.
UPDATE: Let me clarify the question: What are common things that a developer would use the new host of supported managers in VS2015 (gulp, bower) for, that he can't do without them?