I have over 3000' of drip here on our property for trees, shrubs, and other plants. I put it all in actually buying a shallow trencher to save money over renting one.. Last year was the first year we used drip on our garden and I am sold on it. We had tried sprinklers and hand watering before, but the problem was you always ended up with water in places you didn't want it and thus weeds developed. Drip really seems to help with that. After tilling the soil we put down heavy black plastic everywhere , weighed it down with bricks, and waited a week for the heat to kill the weed seeds under the plastic. We then cut holes where we wanted our plants and planted the shoots and the seeds. I bet I spent less than 1/2 an hour total all season pulling the few weeds that came up next to plants.
The way I did it was to buy a cheap sprinkler timer so that I could have the system come on in early morning for however long I needed it. Then I ran 1/2" plastic pipe from the timer valve all the way around the garden in a loop so there would never be an issue with flow. Then I put tees in so that I could run the 1/2" next to the plants, put drippers into the pipe and put 1/4" tubing on the drippers to each plant. The drippers come in 1/2 gallon per hour, gallon per hour, and 2 gallon per hour so you could tailor the amount of water that each type of plant required. For plants like tomatoes that are easily overwatered I put inline shut off valves on their pipe so that I could shut them off in mass if needed.
By the way, I am in Lubbock Texas. Our temps last summer were well over 100 degrees for several days, and over 90 for months. I did not see a problem with reflected heat from the plastic. But we did have good air flow to the garden because it is surrounded by chain link fence, so that might have helped.
Watermelons, cantaloupes, greens, herbs, egg plant, squashes, pumpkins, tomatoes, and all kinds of peppers loved this system and produced so much that I am going to have to cut back on plant quantities this year.
All of the drip system components for the garden came from Home Depot.