Nope. It's not a requirement. During my life, my parents have never owned, borrowed, or rented a manual transmission car. I know of only 2 or 3 people that even have them. It's remarkably rare here...
Just to clarify, you must mean in the Baltimore area.
I live in Los Angeles, and we love our cars (there's an old song "Nobody Walks in L.A."). Manual transmissions are pretty common here, and until my newest car (a 2007 Prius), I always had a manual. I would have gotten a manual Prius, but they only come in CVT (it's an electro-hybrid-mechanical-planetary-magical transmission).
The weather here is great - it was just in the 80's F (27 degrees C) a few days ago, where it's suppose to be Winter. The coldest it typically gets is mid 50's during the day (13 degrees C). I've gone skiing 2 hours away (crappy mountains) one weekend, then body-board surfing the next.
Housing is very expensive compared to the rest of the US, at about double the average price per square foot / meter.
Public / Mass transit is a joke in Los Angeles. There's a stigma to taking the bus - an assumption many people on it are crazy / homeless. I just took the Metro train last weekend for the 2nd time in 5 years, just because it was easier to park my car in Little Tokyo, and take the Metro into Chinatown for a parade, then park there.
Consequently, we have horrible horrible traffic as most people drive to work, and due to urban / suburban sprawl, people tend to live far from work. My morning commute takes about 1 hour to travel 25 miles (40 km), when I leave at 6:30am. If I leave at 8, it'll take me 2 hours.
Gasoline prices are higher than most of the rest of the Country, but nothing like Europe ($4 / gallon or about 1 euro / liter).
Getting a drivers license is a lot easier here than most places in Europe. Consequently, we have a lot of bad drivers. When it rains in Los Angeles (happens a few times a year), traffic grinds to a halt, due to accidents.
It's a very diverse population. You can meet people from all sorts of places, and eat lots of different kinds of food. The cuisine tends to be healthier than many other parts of the country - less heavy and more fresh stuff.
The night life is (from what I remember when I had one), was decent, but not as crazy as New York. Most clubs here close by 2 or 3am. Some places I've been to in the country, bars seem to close by 10pm.
The beaches are great - not exactly pristine, but good on a hot day. There are hills and mountains great for hikes / photography. We've got a lot of museums (of course a big Automotive museum), but the art tends to pale in comparison to Europe, where most of the art came from.
I Love L.A.