I don't intend to read 14 pages of (most probably) arguing, so I'll just straightly answer the question from the OP.
1. I never liked any meat, except poultry. I ate it because it was there and I had no other choice (and honestly, it was a bit of a bother to change my lifestyle). I know there's hundreds of tastes of different meat, but 90% of it was pretty distasteful to me. While I still ate meat, I already never liked bacon and sausages, and I really disliked pork and beef.
2. I absolutely adore all vegetarian food, especially various Asian cuisine. After I've finally "switched" over, I was wondering why have I been eating things I didn't like for 18 years of my life.
3. It did wonders to my health. Now, this is obviously a personal experience, so I won't say it's generally better. But it was for me. I feel better, I can eat much more without feeling bloated, without being too full and having the need to vomit, my period pains are gone (along with some other period problems), and although I was anaemic my whole life (despite eating meat), since I don't eat meat any more, I've been feeling extremely better (my anaemia is still somewhat present, and I don't think I'll ever fully get rid of that; point is, I no longer have problems with it, and I practically don't even notice, while before, I had problems with breathing after any small amount of physical activity). I generally feel (and am) healthier.
4. I love animals and am disgusted by the treatment of said animals. I've always felt bad when I thought about how my food arrives to my plate and since I gave up on meat, I feel so much relief, that it's almost transcendental. However, I would never spoil someone else's lunch by preaching my ways nor do I ever complain to people when they eat meat. You can't be a vegetarian by force, or solely for this one reason, it won't work (and, what's the point anyway? If you don't like it, don't eat it. The issue has never been the sole eating of meat anyway; the issue is exaggerating, as with everything).
Other reasons people may have for being vegetarian (that I didn't personally have) are religion, allergy and various diets.