I've never even given a second thought to vaccinating my dogs. I have always done just what the vet recommends. Everyone I know has always done it, too, with no problems. There is a risk with EVERYTHING you do. When you walk out of the house you are taking a risk. Likewise, you are taking a risk whether or not you decide to give the shot. If you DO give it, there is a risk of reaction. If you DON'T give it, there is a risk of catching Bordatella. So, I think you should decide for yourself since none of us here know you or your day-to-day habits. You need to weigh the risks and the benefits and see which side wins out.
Bordatella is the same thing as Whooping Cough in humans. It can be VERY serious, especially if it gets into the lungs. It can cause pneumonia, and antibiotics cannot always clear it up. I have seen many people on here who have said their yorkie has had Kennel Cough for several months and has gone through several several rounds of antibiotics to no avail. Just something to consider.
Something else to consider...out of ALL the dogs you know, how many have had an adverse reaction to the Bordatella vaccine?