but I don't even know why I would want to use VST 2.
That tells you that you don't need to worry about it. VST plugins are usually used to manipulate the sound. There are loads of plugins available to do loads of different things. Some are visualizations, some are room correction, and some are stunts. If you're happy with the sound you get from MC, why bother? I've used MC for years, and I use zero VST plugins.
On the other hand, if you're the sort who likes to tinker, like installing colored LED lighting all over the interior of your car, or pneumatics so it can bounce up and down, then you could browse the Internet for all the VST plugins available so you can trick out the sound you get from MC.
Just because something exists, doesn't mean you need or want it.