I often asked me what it is I like about Virtual Desktops. One can arrange windows side by side, a window with HTML and a Preview of this for instance.
But I think Virtual Desktops just offer a kind of sense for order, a feeling like: "Here is this and there is that. When I'm done with this, I switch over to that. It's true, you _seem_ to get the same by switching applications. But somehow it is _not_ the same. You can switch through 'sets of windows'; and these make the environment you are 'in'. Hard to explain better.
But yes, you can try it without doing something irreversible. As I said, I use Virtual Desktop from CodeTek, but I also tried Desktop Manager (which is also a really great product, including more EyeCandy). But I preferred Virtual Desktop for its interface and (to answer your question) I got rid of Desktop Manager easily and without any hassle.
So just enjoy giving it a try