When I was at Google I remember seeing an email on one of the lists from Steve Yegge about GWT. Steve was talking to one of his buddies whose team was using GWT. I don't remember the exact phrasing, but it went something like this:

stevey: I hear you guys are using GWT, how's that working out for you?

buddy: It's kind of like programming while wearing mittens.

stevey: Mittens are good, right?

buddy: Not if you're trying to type.

Make of this what you will.