I've seen several video's like this, and comments on this forum that there isn't much difference between NVMe and SSD in game load times. But I still went ahead and brought two expensive 970 NVMe's, mostly because I could but also to reduce the clutter in my case.
Even after reading there wasn't a noticeable difference in load times between the two I was still a little disappointed when I finished my new PC, despite knowing better I still expected the PC to boot in a flash and games to just magically open.