I've come really close to getting burned by that many, many times, so no, you're not the only one.

At least Hilton has gotten better about sending confirmations in a timely manner. In the past, I'd not think anything of not receiving a confirmation for hours after my booking. So, if I forgot to complete a reservation, it would probably be well out of my mind and never cross it again. Now if I don't get a confirmation, I wonder what's up.