I don't mind it, however I live at an apartment complex where 10+ other people sleep exactly on top of my parking spot in which I always have to back into.
I really really dislike bothering them with that UFO sound at 3-4 in the morning and since almost everyone sleeps with their windows open they always hear me.
Now, if it were a white noise sound, people wouldn't mind. However it's neither that nor a "normal" ICE sound, so the uniqueness of the sound really makes it stand out.
This is why I unplugged mine. Now I actually get this, so I suppose the next step is to figure out the resistance of the speaker and build something that plugs into it and spoofs the speaker. Either that or tape the speaker until it's silent enough.
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