Ear plugs might be a good option. You can get kinds used by hunters and target shooters that don't dull the audio spectrum as much as stuffing cotton in your ears.
Gawaine's suggestion about waiting until the crowds die down is a good one--that is what I usually do to avoid the rude kids and tall folks (for their sake--I'm a very assertive ogredaemon when it comes to enjoying a film for which I've paid good money to see).
Big screens and surround sound do make for quite an impressive experience which I feel is far and away more impacting than a television (even a big tele). I saw the second Matrix film at an IMAX theater. WOW!!!! I was totally blown away by it. The tickets cost $15 and were worth every penny. In many scenes I felt as if I was in the middle of the action, not just sitting and watching it. It was indeed very loud, but I am a former rock musician who had 1500 watts of Yamaha 4115s and floor monitors blasting in my face 6 nights a week for over 5 years, so I am a bit used to it, even after all this time.
To each their own, but there may be ways to enjoy the big screen difference and sidestep the annoyances that tend to come with it. Not all films are so much better on a big screen--but the ones with intense visual effects and panoramic landscapes definitely are, imo.
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