I see that now...

I've since begun installing games on the 2tb drive; I did notice that, compared to my old system, FO4's main menu loads up REALLY fast when installed on the SSD (and that may also be due to a much better video card, etc.), but I have yet to compare how it loads elsewhere. I'm going to move it over there anyway, since it's a buggy, creaky old engine and from what I've read, an SSD really doesn't help it anyway.
Speaking of buggy and creaky, Skyrim loads...enh. Not a huge improvement, but okay. I have run into limitations with the engine though, and I'm interested to see how much better SSE does with 2K textures everywhere.
With all that said, I'm pretty sure Witcher 3 is going to run beautifully no matter what drive I use.

(When I get the chance, I'll pop in over at the tech thread I started to let you know what the deal is with my new computer...it didn't go as planned, but it turned out well anyway.)