...is just the weirdest thing to me! I feel like it does not indicate ANYTHING. Why do doctors even check when being dilated does not really indicate that labor is impending?

I found out today that I am dilated to a 5 and I don't feel like I am anywhere close to giving birth,
I just visited my girlfriend in the hospital though who's water broke, she went to the hospital, was only dilated to a 1, and then had her baby 4 hours later.

What has been your experience with dilation? Am I the only one who feels this way?