There are many Ubuntu users who like Unity interface and its ability to optimize screen space. But the default main menu is a bit of pain as all the categories are hidden by default and it does not support wine menus. There is an application lens but it is way down at the bottom, not movable and most of the time it is folded as I pin lots of applications on Unity launcher.

But, you can now permanently have another classic Gnome style menu in Unity itself, thanks to Cardapio. Cardapio has an excellent plug-in system which not only provide similar functionality to the default Unity menu but is actually more powerful than it. You can create your own plug-in as there is a dedicated API for it. Also Cardapio menu is themeable. Though there are not many themes available as of now, you can find some of them on the web.