This poll is quite useless.
Most likely that most of the new people (new to the WE) use the GUI, and the people that aren't new to it use Jass.
After getting good with the GUI its just too stupid to stay with it as it limits your triggering by so much.
Its the "Programming-Evolution". Eventually every person that wants to create the "real" stuff will move on to Jass.
If you are reading this and say "Wtf is this idiot talking about, GUI rox teh big ONE!!!!111", then you can stop posting (click the Back button) because it will be a useless spam post.