Of course you can still use a file browser and just go through your documents this way, but if you look at the Plasma Active UI as a whole, you will find that putting a "semantic" view central fits in very well (in fact much closer than many file system usages) with how you would naturally organise your "stuff".
The same features are also available in Plasma Desktop, where it serves as an add-on to traditional file system usage. You can for example connect any file to your current activity, and have files connected to this activity shown where you need them. You can even use a file manager to browse through your activities. It's a neat way to make multitasking saner, and if you don't use it, it doesn't get in the way.
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