I have never gone out with someone and gone, "Oh my gosh! You're my soul mate!". Yes, things did tend to move that quickly, but there was no "If you don't commit to me then you don't like me."
On a related note, is it not possible to commit without committing exclusively? It's not like I'm going anywhere, and if something comes up that I have an issue with then I'm going to talk about it; not run away. Well, that is, provided I'm given the chance to talk about it first.