Overall, it was fun. Tons of folks on the train talked to me because of how different my bike is from things they've seen. Everyone seemed to strike up conversation about it. The train did get crowded though.
Today, I'm armed with more experience. I know what to expect, how & where to pay for the fare, how to hang my bike on the DART, and a knowledge that it's less taxing psychologically on me than driving is. I'll be saving a bit of cash, too. My driving commute was costing me a gallon of gas each direction ($8 total), plus wear and tear on the car. My roundtrip now costs me less than $4, and I'll be getting some exercise and sunlight at the same time.
Today will be bike commute #2.