It's great to win when you aren't expected to, but I don't think it would mean more than 2007-8. As others have said, 07-08 was special for many reasons, including beating LA.
If the C's pull off the miracle this year I have to believe they will have received a good amount of help. This would come via underdogs knocking off Miami and/or OKC/SAS, and/or key opponent injuries. This wouldn't diminish the thrill of victory, but not sure it would add to the meaning.