When you create or edit a SmartView, you can mark it as a "Personal" SmartView (by selecting the appropriate radiobutton in "Access Privileges" section of "Create SmartView" or "Edit SmartView" pages).

Once you mark a view as a Personal SmartView, that SmartView will be listed and accessible for just you. Other users can neither see nor access such SmartViews.

You can create a lot of such Personal SmartViews to slice and dice the data to meet your needs, without any worries about confusing other users with too many SmartViews.