Any website using AngularJS already won't work with JS disabled. These are web "apps", not web sites. Therefore there is no need for progressive enhancement in the plugins used if that is what you meant. If you meant AngularJS altogether, it depends on your user base.
To expand on this point - you can build a site that both uses Angular and has a fallback to plain http methods. Forms can do full posts, links can actually link to things, etc. Angular doesn't preclude you from a progressively enhanced site - its's up to the developers using Angular (or any client-side framework) to build for plain server communication as a priority.
However, "Therefore there is no need for progressive enhancement" is also wrong - there is. That's why they use "title" for tooltips, a textarea for code boxes, etc.
