(with respect to Photoshop Service Time...)
"...a full 10 seconds faster..."
That sounds like a lot because we can all imagine the notion of waiting for 10 seconds for anything, but it would have been clearer and more sensible to say the NVMe was just under 3% faster, and that's really not very much at all. Indeed, in relative terms those charts show minimal speedups, to a degree that IMO means any spare cash would be much better spent on some other part of the system for those apps, or in some cases the app in question can benefit from an SSD but not in a manner that is tested here.
For example, After Effects runs best with an SSD used to hold the main and media caches, so it's an obvious thing to test for any gain with a PCIe SSD, and again NMVe over an AHCI PCI solution. You could try a render or other task, since any improvement in interactive response or render time is what matters, but it could be difficult to determine the former.
The Service Time charts don't look at all useful to me. The gains with the NVMe in each case could be a lot more, but one cannot tell as the test isn't specific to where having an SSD can make a difference for each app, AE especially.
Ian.