SSD makes EVERYTHING faster. Not just windows booting.
+1. I turn my pc on and off once a day, booting is normally least of my worries.
However, for the instant application loads, application shut downs, lightening fast installs, it really is worth it.
Office (outlook, excel, word) load instantly every time, even directly after boot, Opera loads instantly, and all those small windows apps (taskmgr, calc, paint) obviously load instantly, it's as if they're all just minimized in the task bar, and you're just restoring them!
Shutdown is also very fast, even if you have 20 apps open, it shuts down as fast as though no apps were running.
I mentioned before, I used my SSD for a month in my old desktop before I got my new desktop.. And when I went back to the 7200rpm drive, it was like using a win 95 pc! I felt like I'd been landed in the stone age again, on my grandma's old desktop.
And whenever I use my macbook pro, it is also painfully slow when it comes to loading apps and documents, when compared to macbook air which has lesser specs, yet SSD by default.
End rant / what can I say, SSD is one of the best PC investments I've ever made...