Spaces is more intended for technical users and/or professional settings. I wouldn't expect the casual user who is just doing a basic task or two to really find it necessary or even helpful. It really shines though when you are running many programs at the same time for a common related task.I am able to keep things pretty simple with my normal usage and even sound recording. Have never found much use for Spaces.
Yes, I use 6 spaces and use the scroll ball click on the Mighty Mouse to access them.
What's the "scroll ball click"? Something to do with BTT or MagicPrefs?
It's one of the standard System Preferences for the mouse.