I posted Cindy's word clouds then had to rush off. The answer to her question is yes, generally these are all about word frequency. Words like 'the' 'my' etc are stripped out.
Of course I couldn't resist doing one as well. I find it interesting to see what stands out. Actually, I noticed words in there I didn't even recall writing! So I went back to my scrawl to remind myself what I was talking about :)
Anyway, I think these low stakes type of activities have a place. It's sometimes surprising what stories and memories you have inside yourself when you allow them to come out on "paper."