I guess it's understandable, since doctors recommend it, and parents want the best for their child, but in my view it seems kinda unnecessary and overblown. Doctors recommend yearly flu-shots too, and I never take those.
I can't stand shots, so this is something I'd personally cancel a visit over. I'd just visit them some other time.
I can see yearly flu shots as a pain especially how it might not even be the right strain, but there's little excuse for not getting a TDaP shot.
The more I think about it the more ridiculous it is. In fact if you're already seeing your doctor yearly they should be giving you TDAP every 10 years anyway regardless of if you're around babies. I mean 1 shot every 10 years and it protects you from Tetanus, diphtheria, and pertussis (whooping cough)! . Sure whooping cough is mild but go look up Tetanus and diphtheria...You don't want to deal with it.
I repeat again...A $20 shot that protects you from 3 shitty diseases for 10 years. How can you be against this.