Are you sure they checked the valve clearances? If it doesn't say it on your invoice, they didn't do it. And this is actually a rather important step. It doesn't matter how the bike sounds. Out-of-spec valve clearances don't necessarily make a funny sound. (Or at all?)according to the sheet that the dealer gave me basically after checking everything all they did was lube/adjust the chain, and change the oil/filter.
Some people get lucky and their clearances are exactly within spec and thus don't have to pay for the extra time and materials to have them adjusted. Most are not that lucky. I honestly don't know what happens if the valve clearances go significantly out of whack for long periods of time (shortened engine life? poor performance?), but clearly Honda means for you to keep them in spec or they wouldn't have put it in the owner's manual. Lots of dealers have been deliberately skipping this important step because it can take lots of extra time for not as much extra money.