The score was tied at 0-0, and there was one out and a runner on second. The batter was intentionally walked. The announcer mentioned that this guy who was being walked did not matter.

WRONG!

(The remainder of this post concerns situations in the home half of the 9th and extra innings in a tie game. Slight adjustments can be made for situations in which the home team trails by a small margin.)

If the runner on 2nd got thrown out at home (or 3rd or picked off 2nd) before the 2nd out was made, the guy who got the intentional walk would suddenly represent the go-ahead run.

The guy who got the intentional walk would not have mattered if there had been two out. On the other hand, if there had been nobody out and the bases had become loaded with two more batters without the original runner scoring or making an out, the two additional batters-turned-into-runners could have mattered, if the lead two runners were cut down on the base paths for the first two outs of the inning.

It's true that if the number of runners already on base equals or exceeds the number of outs still left in the inning, new runners don't matter. Well, in a way they do, because if a batter hits a walk-off homer, they count in various statistics such as runs scored, RBIs, and ERA.

I'd be interested to know the earliest 90+ game score efforts in a player's career, I'm sure it's been done even sooner (Wilson Alvarez?).

What is also interesting is that it wasn't the only game I attended that ended with a 2-1 Padres win over the Mets in 14 innings.
This was the other one- http://www.baseball-reference.com/boxes/SDN/SDN200604210.shtml

Also, it's not like I'm a season ticket holder who has attended 500+ games in my life. I have only attended 38 games and this dates back to 1986. Yet, two of them have been 14 inning 2-1 Padres wins over the Mets- one at New York and one at San Diego.