I'm with B on ssds. Too lazy to cope with a small SSD capacity and consequent space management. I have 10k rpm drives and load into bf3s round-starting-nothing-happening time mostly. Very rarely the round starts before I get there but I miss about 2 seconds and its really hard to grab vehicles on round start anyway.
I don't bother putting games on mine, there's not as much a difference with loading games for some reason, perhaps file structure or something.
The windows boot time is nice and I rarely use sleep anymore, but the main benefit for me is editing video and photos, an SSD really shines there.