Is there any advantage to installing Windows on an SSD besides a faster boot time? It seems to me that I could save 30GB of valuable SSD space by leaving windows on the hard drive and only installing apps and games on the ssd.
Well, you could do that. Most people find that having the OS on the SSD and your games and apps on the regular drive provides a better overall experience, since Windows basically "runs" everything else. But, in a perfect world, yes it would be best to have everything on the SSD, but I wouldn't suggest putting the OS on the slower drive.