First of all, your vision of cows wandering freely in green pastures and farmers cheerfully throwing feed out to the chickens as they peck about the yard in idyllic peace and living a happy life until the butchers blade comes is very naive and distorted. Yes, many smaller farms which produce what you might call organic products offer their animals a very comfortable existence, but the modern farming industry is rife with cruelty and most animals live in terrible conditions.
This is how a typical hen which produces most of the eggs you'll find at the grocery store spends her life:
Confined to a cage where it can do nothing but eat and lay eggs. When egg production declines, I assume it's slaughtered for meat. Do you care? This is a personal question, and honestly the ethics of modern farming methods are only a secondary issue in my opinion.
The real concern with animal consumption is environmental. A huge fraction of pollution, deforestation, and CO2 production directly stems from the production of meat. For every pound of beef chicken and pork produced, some number of acres of forest had to be destroyed to produce farmland to grow the feed for those animals. Soy farming, for the production of cattle feed, is the leading contribution to the destruction of rainforests in South America (at least circa 2009 when I did research on this subject).
That being said, do I eat meat? Yes I do. Mainly because at this point in my life, to substitute the nutritional benefits of meat (i.e. the amount of lean protein I require to achieve my athletic goals) with a purely vegetarian diet would be cost prohibitive. Veganism is extremely fashionable, and frankly expensive. It's very easy for me to grill up a chicken breast and get a good 40-50 grams of protein with having to consume a huge amount of food. I don't know how to accomplish that with just vegetables. I don't know of a single person who is vegan and successful at strength-related sports who is not of very small stature (i.e. has below average caloric requirements).
So yes, I eat animal products, mostly out of selfishness. Ultimately, however, I think there is no real ethical justification for consumption of meat. We just value, as a society, personal vanity, expression, dietary preference and athleticism above animal suffering and environmental destruction.