I've never ever ever (ever) sat an exam where I've used the total amount of time given, until I sat my World Class Standards exam this week. I was still writing right up till the last second.
I was also a little worried about my handwriting, as it gets pretty bad when I'm under pressure and having to write fast (I think its something to do with my brain working faster than my pen). But when I was chatting with one of my class mates, he said his was reeeeeeally bad. He said he kept swtiching from capitals to lower case in mid-sentence!
We both hope there's no "marking down" for spider writing on the exam paper.