As stosh said, the beauty of laminate floors is that they are floating and a piece or two can be replaced.
We have laminate in our entry hall and kitchen. We have had it for over 5 years and love it still. It looks wonderful and I have not had any type of problem as far as moisture. A few months ago, I bought a new coffeemaker. It was trash day and my husband took the old coffeemaker to put it outside in the trash. For some reason, he grabbed it by the filter basket and when he got to the middle of the entry hall, the rest of the coffeemaker slipped out of his hand and hit the laminate.
We have dropped many things on this laminate and rarely has anything caused problems to the floor. But for some reason, this silly plastic coffeemaker must have hit the flooring at just the right angle to take a chip out of the floor about the size of a dime. I know the feeling all of you mention when you say how dismayed you are at a problem with the floor!! For about 5 minutes, we just stared at the chip and couldn't believe that it was there. And it was right there in the middle of the foyer - no way to disguise it or put a vase over it.
Floating laminate is not attached to the floor. The pieces slide and lock to each other so parts can be replaced. In our case, we installed the laminate ourselves. We kept a lot of extra pieces. It was a little bit of a hassle, but we removed the piece of laminate molding laid between the foyer and kitchen. We did break this molding, but we saved enough of the original to be able to replace it also. Then we had to take up some base molding at the bottom of the walls to get enough room it be able to pull the laminate up about 1/2 an inch to be able to slide the pieces out.
We had to slide out two sections to get to the one that had the ding in it. But we were able to slide a new piece into the grooves and it took the place of the messed up one. We were so pleased that the new replacement piece looked so good. We were afraid that it would be such a lighter color as the rest of the floor was 5 years old. But it matched very well and if someone did not know it was replaced, they would never guess what happened.
So to you with problems, if you did the floor yourself you can also fix it yourself. It is not the simplest thing in the world to do so, but it is well worth it. If you had someone install the floor, give them a call to help. The only problem I could see is if you did not save some extra flooring for such situations and possibly your style is not made anymore. But best of luck to you.....I know what you are feeling about a messed up floor.