They don't make double bills like they used to. I got in on the tail end of the double feature, which was a routine practice at second-run theaters until (at least) the early 80s. As a child my parents only took me to see one or two movies per year, so when I got to my teens and realized I could see two movies for the price of one, I became an addict (my all-time favorite double bill: Excalibur and The Howling). Nowadays you have to create your own double feature, and be willing to pay separate admission fees for each movie. Add in the cost of concessions, which is hard to avoid if you're at a theater for more than four hours, and the price can get out of hand.
Multiplexes don't make it easy to watch movies back-to-back, either, staggering their showtimes to maximize the number of screenings per day, accommodate the sharing of film prints in more than one auditorium, and so forth. All that is understandable from their standpoint, and doesn't present a problem if you're only seeing one movie at a time. But when I'm trying to catch up with several releases that I've missed, it gets to be a big challenge. Let me give you an example.
To varying degrees, I wanted to see all three movies that opened in wide release on Friday (G.I. Joe: The Rise of Cobra, Julie & Julia, and A Perfect Getaway), ideally one after the one at the first available opportunity, which, for me, was during the day on Saturday.