I'm pretty sure we've all been asked the question "If you had to keep just one sense, which one would it be?". I've always answered sight, mainly because I love color and don't really like to be in complete darkness (as in can't see in front of my face dark). I can deal with loss of taste or smell. With years of dealing with sinuses and allergies, I've lost one or both of these temporarily enough to know I can live without them. Yet, with my current earache, I'm reminded of how much I like to hear. So, right now, if you came up on my right side, I would barely hear you or turn around to you blindly and say "Huh?". Just like an old lady!
What about you....what sense can you NOT live without?