I think you should try to go back to taking it as 'Thank you for thinking of me.'
Seriously - that's pretty much the primary sentiment most people are really trying to get across to you. Yes, some of them really do mean that they'll
think to the airpray for you, and that's their business, but really, I'm pretty sure even those people are, first and foremost, letting you know that you'll be in their thoughts.
Or, I suppose, they're saying it as a mindless pleasantry similar to 'Have a nice day' and are just fulfilling their end of the social contract in the way they best see fit. And you still shouldn't be too annoyed by it.