Yea most of these games load so fast already. Think of it this way.
HDD Average Read Speed (80-120MBps depending on hard drive)
SSD Average Read Speed (450-550MBps dending on SSD)
NMVe Average Read Speed (2500MBps for 950 Pro)
So lets take the average (These read speeds are also Sequencial read speeds so you won't always get them)
100 MBps for HDD
SSDs are usually 520 for a good read speed on most that i have tested
and then the 2500
So the SSD is 5 times faster than the HDD and the NVMe is 5 times faster than the SSD. if you have lets say a 1Gb file that the system loads on a HDD that is 10 seconds (Usually more) a SSD that reads at 520 takes 2 seconds and then the NVMe takes .5 seconds
Going from HDD to SSD and a 8 second faster...