I used to see a flick every week when I was back in college. Over the years, that's decreased, and not I only see a half dozen movies a year in the theater.
But I had to build a home theater to still get the experience. Without it, I'd still be seeing a lot of flics in the theater just because you can't beat a big screen and great sound.
Even with the HT, there are still some flicks that just need to be seeon at the theater. Avatar, Alice in Wonderland, Clash of the Titans, Iron Man 2 - these are flicks you really need to see at the theater.
I also like taking my kids. It's one of those things that me and them do together on a regular basis that they'll look back on and remember as an event, long after I'm gone. There's only so many of those opportunities, especially as part of regular life, so they're worth grabbing even when they are overpriced.