I like the default moi UI but, in my case, I prefer to use some Alternative UI done by other users in this forum. The power of moi is that you can arrange the UI in the way you like. That's not possible in other program (I never use Rhino because I don't like the interface, I cannot explain why but I hate it).
So standing ovation for Michael's UI because it's so flexible and can fit all the need!

Luca