Do you not find it distracting sometimes, Aaron? I don't mind it most of the time, but there are occasions like in Mr. Bean for example, where you have one person snorting and shrieking their head off. It detracts from the show.
70s/80s are normally the worse offenders, and I'm not even talking about canned laughter, just the live audience.
I'd say the worst ones are the clip/home movie/hidden camera shows, but fortunately I don't watch too many of them.