Amen. The first time I saw
Superman Returns, I willed my bladder closed for the entire Kryptonian continent sequence because I figured the movie would be over in 15 minutes anyway. Imagine my agony when it turned out that I was 45 minutes away from the end, not just 15.

(Still, great movie. I saw it 3 or 4 more times in the theater.)
You can pretty much carry in whatever you want if you've got a purse or you're wearing a jacket in appropriate weather. I've never been to a movie theater that was searching people at the door.
The only times I've seen theaters searching people at the door were for preview screenings or midnight openings searching for video recorders & camera phones. The theaters in my area are extremely lax about searching for food & drinks. I often bring in a whole tote bag full of bottled water and they don't care. (But then, I don't think movie theater employees are paid enough to care.) One time a theater even let me bring in an entire footlong Subway sandwitch once I told them that if they didn't let me bring it in, I'd just sit out front and eat it before I bought a ticket. Granted, this was on a particularly slow day at one of the slowest theaters in town.
In the '80s where I lived in central Florida at the time, they opened a couple of places, the "Cinema & Brew" and the "Cinema & Pub", IIRC. Both featured bar and table seating where you could order real short-order food, like chicken fingers and such, as well as alcoholic beverages. And they did let in kids, they just couldn't serve them drinks. I don't know why that didn't take off. One of them was still going in the mid-'90s, though I'm not sure if they're still around today.
I'm not sure either. There used to be an indie theater near my dad's house called the Madstone. They had a wine bar and showed pretentious, artsy films (and the occasional revival of
Evil Dead II &
Ghostbusters). But they didn't let you take the wine into the actual theaters and they ended up getting driven out of business by the Harkins Valley Art & Harkins Camelview because they got a better pick of indie films to show.
There is also a theater in Chandler that has changed ownership several times in the last several years. (It has probably the worst location of any movie theater I've ever seen.) For a while anyway, they served short order food. I'm not sure if they currently do under the current management. (Their new speciality seems to be weirdo art films like the one that Crispin Glover directed and midnight screenings of
The Rocky Horror Picture Show.)
I'd agree that most movie food sucks now. The nachos are stale. The hot dogs are like shriveled up dicks. The few places that sell chicken fingers, they're mostly dried up breading with hardly any meat on them. What they really need to do is, like, build movie theaters that have an entire working McDonalds built right into them. (Personally, I'd prefer a Subway but I figure McDonalds is so ubiquitous that they're more likely to try it sooner or later.)