Left 4 Dead 2: How long before dialogue gets annoying?

I'll be buying the game no matter what, but I do want to be prepared for the likely scenario that the novelty of one of the games best features might die off and turn on me like the reanimated corpse of a once-beloved friend. The game mixes up some of the conversations, and there's lots of different rare, situational lines you'll hear (e.g., if you accidentally shoot Nick, and then get helped up by him, he'll say something like "Now if I help you up, are you just gonna shoot me again?"), but I wonder how much this will really extend (heh) the life of the in-game dialogue.

Input appreciated, and a fap would brighten up my day, fye.

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