Games load a bit quicker. You’ll see a benefit on something like GTA5 or massive games like that. I know a lad who bought one for BFV and although he loaded in first he was still having to wait for the rest of the server to load in the game start timer anyway.
Yup, stuck an SSD into my Pro, load times are noticeably quicker, especially after dying and restarting a checkpoint. Any 100% digital games (no disc needed in drive) load significantly quicker.