Hi Petri,
The Exchange team has not fogotten the GUI. They are planning some major enhancements to it comming in SP1 and there might be even more in SP2.
What powershell does is give you an incrediably powerfull tool for performing tedious tasks quickly. This script was just one example where in 20 minutes I was able to write a script that would fix any number of affected object in my environment ( I know personally I have worked with customers that had over 150 affected objects).
But this script is an example of a more complex script that can be written to I rapidly solve a problem you are having (I will admit this is a one off resolution).
I will try to provide you with some quicker one liners that can be used over and over depending on your needs.
-Matt