Being a vegetarian changes your life in more ways than changing what you eat. You are forced to slow down because you have to think more about what you are eating. No more grabbing a McDonald's burger for a quick lunch. Maybe if vegetarianism becomes more accepted, and McDonald's offers veggie burgers, you will find "fast" vegetarians but for now being a vegetarian means making most of your meals, cooking from scratch, eating grains and vegetables instead of animals.
I have been a vegetarian for over 25 years (started in my mid-20s). In the early 80s my husband and I were looking for a healthier way to eat and worked our way from Pritikin to McDougall to vegetarian and ended up at Macrobiotics.
When vegetables are the main part of your diet, you want the best vegetables you can find so we eat organic and try to find locally grown/produced foods. Cooking dinner is one of the calmest parts of the day for me and I really enjoy preparing our meals.
I left the traditional business world (and gave away my suits) a few years after becoming a vegetarian. For me it felt like becoming a vegetarian was the first step in making a lot of changes in my life, to live more intentionally and to slow it down.