Well...... the good thing about Linux (being a Linux user) is that there isn't a "linux interface". The OS is designed so that any number of interfaces can be used with it (and made for it.) I know certainly with Linux KDE and GNOME (2 most popular Linux GUIs) were designed to resembe Windows in many ways - the reason is simple, in order to attract normal computer users they want to make it seem familar and comfortable with what they have used before.
Personally, I dislike this approach. A major bug bear I have with Windows is that its designed to be easy and simple to use - however that means that tasks can take a lot longer, with more mouse clicks, than if I was allowed to do it my own way. This is similar with some GUIs also.
For these reasons, the main interface I use is ROX (http://roscidus.com/desktop/
) - this is completely different from the "normal" interfaces and works very well for me