Triggers suck, totally suck.
The bad thing, IMO, about triggers when you have a remorseful spouse that gets the pain they have inflicted and have done work to move on...is they don't get the things that make us trigger.
My husband was the same as your wife. The obvious triggers were there, and he would help with those.The ones that I created on my own...a song that made me think of the A, a place where they ate when we would drive by, a date, a phrase...christ, the wind blowing in a certain direction. These things would set off bells in my head, but not in his. We both have different memories and "important pieces" of the A that are not the same for the other person KWIM?
So you have 2 choices....suffer in silence or talk about it.
If you choose to be silent you have removed an opportunity for your wife to help you heal.
If she is doing the work and gets the pain she has bestowed upon your marriage she will want to help. After I had to explain a few triggers to my H and he obviously had no memory of a few of the things that triggered me it was a welcome relief to know he was able to let her go so easily, she wasn't in his mind. I was and our life was.
The last trigger that bothered me happened last summer, almost 5 years out. I thought I was done and felt ridiculous telling him about it, but I did.
It made him sad, I could see the pain in his eyes as he hugged me and apologized again for the hurt....five years later and not an ounce of "get over it" from him. It helps to know that no matter what he is there and still carries the responsibility for the pain.
Well that was long winded...
In short, yeah you are right