It's not like I'm against ssds or something (I also use a ssd as my system-drive) but I don't think a ssd suits the "casual PC-user" since the system needs to be adjusted (e.g. systemssetting to reduce R/W-cycles like turn of winsearch and more complex stuff).
I didn't get a SSD for gaming, but since i have one, i might as well install a few games on it if i got the space, GW1 had noticeable better performance on a SSD in crowded kamadan since it has to load a lot of textures from the HDD for example. Some people noticed stuttering in GW2 on slower HDDs due to similar situations. If you look at past build threads, we've been recommending the SSD once the other components were taken care of and the person's budget still allowed it.
I did run into situations where i had to page some stuff to the drive (work related) and man was i glad to have the SSD at that time. Like you said you don't get a SSD primarily for gaming, you get it for the fast access times and faster reads/writes for other programs and the OS.
The more adjustment the better (as long as you know, what you're doing ).
Just like I said: ssds are nice tools but you have to use them properly