XML or urlencoded?

I am working on a project and I need to load several text files into flash. I have heard that XML is very good for this so I have started a tutorial about XML in Flash. I am very surprised on how BADLY XML and Flash comunicate. From all that I have read so far I’ve seen that XML has a larger filesize, it takes flash more time to get the data and it is much more complicated than using simple text files. I see that text files are much better than XML. So what is the point in using XML in flash ? Is the fact that XML has arranged text worth that much complication ?
About my project, I mill make an admin for it that would automatically write and update the text files so there is no point in the text being arranged. So is it ok if I simple use urlencoded instead of XML ?