I'm as anti-hassle as it gets, but I think email validation actually makes sense. If a company NEEDS my email address for communication, go on and verify if it works and an overly eager spam filter inbetween does not eats everything up. Or if, god forbid, I accidentally put a comma instead of a period somewhere while typing.
If they don't care whether I can be reached by that email address, why even bother asking for one?