We're not even slightly vegetarian, except in the Anthony Bourdain way, likely paraphrasing: "If you could cook vegetarian like this, fucking hippies, I'd eat vegetarian every day." Yup.
The thing about competent vegetarian dishes is that they are a pleasure to eat. But it is hard to get a pure "American" vegetarian cuisine from individual cooks that isn't hmm, dreary. The thing about Madison is her recipes are not dreary. I often consult her soups and stews recipes for instance to understand how she is flavoring these w/o meat (and especially, meat stocks).
Also, I remember seeing a comment somewhere to the effect that Indian food is the only cuisine where being Vegan doesn't become a chore.
Edit: ISBN ostensibly 9780767900140
It's been a great source of inspiration and I know a few of the recipes essentially by heart. My main comment now is that the ingredients lists reflect the range of veg and herbs that you typically could find in a 1982 UK shop, and I often substitute more exotic ingredients that weren't readily available then.
As others have said elsewhere here, after many years you typically don't need to slavishly follow the steps in a recipe (except perhaps for baking where precise ratios of ingredients can be important). For some cooks (notably Delia Smith) I've simplified their recipes over the years to reduce the number of discrete steps, utensils and cooking time involved. The results might not look as camera-ready perfect as the pic in the books, but the taste can be indistinguishable, especially when throwing something together quickly for a weekday evening meal.