Unlike you, I go to a lot of films. So it saves me money and time. Namely the price of a ticket and a couple of hours. If I feel I have seen the film, then I don't have to go.
This also acts as a great filter, because if there is a film I think I know and dismiss and someone says it is great, my first question is "The trailer sucked, is the film different?" and if the response is in the affirmative, it immediately goes to my top list. Split is a recent example of this. Predictable silly trailer, great film.
So watching the trailer for this film, I have now seen the Mummy before it was released and know it is bad. I normally would not go as I could quickly write out the screen play for you...Unfortunately, my significant other loves all things Egypt, and therefore I will suffer the mummy's curse anyway. But that is what matinees are for...
IMHO it Is a losing game trying to avoid seeing a trailer as they are everywhere. If they don't catch you in the theater at another film, they catch you on your TV or You Tube. Why expend so much effort just to be surprised that you wasted 10 bucks and 2 hours?
Used to be a time when you were guaranteed the trailer was not the film. In fact, trailers were much more entertaining than a film as it seemed trailer making was an art unto itself But that is no more.