Not really sure what you're asking here. Jeavons' book is one of the most popular primers on growing vegetables and with good reason. Plenty of people skip or skimp on the double-digging part, and still get really good results. Mel Bartholomew is another how-to-grow-intensively that is pretty good. If you're a left coast person, anything that Steve Solomon or
Carol Deppe writes is a must, and plenty of people in other climates make good use of their methods. Eliot Coleman writes from the point of view of a small farmer, and has a lot of creative ideas about how to get the most production with the least expensive inputs. Also check out Robert Kourik and Rosalind Creasy. There are many more, but if you started with those authors, you'd have a huge range of ideas to work from.
The annual temperate-zone garden vegetables you mention (carrots, parsley, pumpkins) are highly bred, and expected to produce high yields. You will need to attend to the tilth and fertility of the soil you grow them in, and that requires work. Like many people, I think it is a highly rewarding way to spend my time, but you have to put a reasonable amount of
energy into the system in order to get the high yields these plants are capable of producing. In the case of the Jeavons method, the high initial work is compensated for by the high yields, and with time, the work does decrease.
If you are willing to change your diet, look into the book
Perennial VEgetables. That has the best info I know of on veggies that require less input than the traditional annuals, and these plants in general do require less work. But generally they are less productive per plant, so you have to plant more. People are experimenting with reducing the amount of veggies they eat, and relying on tree and shrub crops for much of their food. If you are looking to produce the most amount of food with the least amount of personal energy input, that's probably the way to go.
If you tell us where you are, and what kind of
land you are working with, we can undoubtedly get more specific!