FWIW, for me, I find the delayed gratification just tempers it: I will almost never be more excited to watch a movie than the day I hear about it... if I can't watch it right then 1) I will almost certainly forget to watch it without a reminder (so they will have to pay for their ad at least a second time) and 2) I will have time to let my brain decide "well it probably will suck" (and it almost certainly wouldn't need to be advertising to me this hard if it were actually good: I'd hear about it from the first wave of people who see everything if it were!).
Well I was talking about a different time, where film distribution (literally) was still done by a lot of players, and movie theaters actually had several owners (before they closed down or got bought by big chains). A time when local theaters didn't have access to the movies for some months as well.
With that said, the majority of people won't forget it, especially with the media budgets used for advertising - promos, appearances, going on the talk shows tours, PR to news/magazines/, etc that's all coming out of the promotion budget. You probably don't realize it but you get in contact with movie promotional material several times before it launches.
Maybe you like just a particular set of movies, so the majority leave you little impression. I have movies that are completely oblivious to me, others that stick and leave me curious, but probably with so much content, noise and distraction it's normal to don't recall it all.
In my youth I recall that The Matrix, LOTR, Kill Bill, Harry Potter, all left me with big anticipation to watch them, for months if not years.
