Whoops, sent too soon. How the equipment relates to the task:
1. You generate more power when you're bent over at the waist. It gets your glutes into the action, which are the biggest muscles in your body.
2. You can be more aerodynamic if you present less frontal area to the wind. Drag is proportional to the square of the velocity, so an effect that is not significant at 10 mph with a 13 mph tailwind becomes *very* significant at 12 mph with a 13 mph headwind. When you're only going a couple of blocks, most of your time is spent getting on and off the bike, locking it up and so forth, so you really don't care if you average 7 mph or 14 mph. But you probably can't afford to spend more than two hours a day commuting to work, and if that commute is 12 miles each way, you're going to need to be traveling somewhere around 15 mph most of the time. So aerodynamics starts to become a practical matter. Even if you think you're not a strong enough rider to develop any speed, we have a lot of hills around here. You can easily reach 30 mph on some of those downhills without working a bit. You paid gravity's price to get up that hill, now if you want to get as much of that payment back as you can, you'll care about aerodynamics. Drop bars reduce your frontal area in two different ways. First, they allow you to bend down and get some of your torso behind the rest of you. Second, if properly sized, they bring your arms in closer to your body so you're not making a parachute of yourself.
3. Drop your hands to your sides. Relax. Now, without moving your hands, lift your arms up in front of you. The position your hands are in is a nice neutral position for your wrists. The more you deviate from that, the more likely you are to develop carpal tunnel syndrome, or just plain numbness and tingling in the hands. Mountain bike bars are about the worst on this score. There are various kinds of upright bars which provide better hand positions, and could also be an option.
Yeah, it's time for bed now, so that's it for the moment.