I'm surprised that US didn't add in $10 (or whatever token amount) for dinner, since I'm sure they gave the other passengers a voucher for $10. I've never been reimbursed for extra parking -- ever.
That said, I was delayed 3 hours on WN (PHX-SEA flight) due to a mechanical problem. They gave us a $100 travel voucher, which was roughly the cost of my flight. I was absolutely thrilled. WN made a mistake and they essentially refunded my trip cost.