I learned to drive using both, but my first 4 cars were automatics. Then I found a sporty little car with a stick (the only way it should be sold) and loved it. Then I bought a truck, which is my everyday vehicle, with a manual transmission. It is definitely annoying in stop and go heavy traffic, but I don't do that much of that type of driving. Here's my two cents worth:
Advantages
1. Makes you feel like you're more in control of driving (young guys tend to really enjoy this aspect of it)
2. Better response and feeling of more power, especially if you have to buy a 4-cylinder or something with little horsepower.
3. Little better gas mileage
4. They can be push-started.
5. Friends and relatives are less likely to ask to borrow your car since most of them can't drive a stick.
6. I think they're better for driving in snow because you're more aware of your rpms, but some differ with me on that.
Disadvantages
1. Some embarrassing moments when you're learning.
2. Heavy traffic leads to left calf cramps.
3. Makes it difficult to do other things while driving, but I think you should be required to pull off the road to talk on your cell phone anyway.
4. Being stopped at a light on a steep incline can be a little aggravating if the car behind you is right on your bumper. Usually better to just keep the clutch out a little with the gas applied instead of clutch in and foot on the brake. No backrolling that way, but rough on the flywheel.
Number one advantage - if you're a young guy, you'll probably love it.
Number one disadvantage - if you have to drive in heavy traffic alot, you'll probably hate it.
As for the learning to drive. I taught my nephew in my sporty car when he had his learner's permit. You really have to learn by doing and the best way is to go to a big empty lot somewhere and practice a few times to get used to the feel of the clutch and when to change the gears before going out the road. I love my car and I love my nephew and there was NO way I was putting them together on the highway before it was time.
I took him to the high school parking lot on a Saturday and then on that Sunday. By Monday he was on the road driving and for his first vehicle he has a Ford Ranger with a stick. He loves it of course.