Well, I found that only one game had put saved games on the C drive - that was Amnesia The Dark Descent which was a download from Steam. All my other games - which I installed to the D drive during installation - have saved games in the game folder. As usual, there were a couple of casual games which had saved games to the hidden file App Data/Roaming, but I check there all the time. I think that's only the second time I've found anything there - they were two of the Rose Briar HOGS from Big Fish.
So, I guess it probably depends on the game. One of the prices to pay for a speedy solid state drive is an extra drive to search!
Fireplace, yarn, knitting needles, books, wine... check. Yup, I'm ready for winter.