Well i don't have a ssd also but i mainly play battlefield bc2 and even if your the 1st one to load up in bad company 2 there's still a timer so for battlefield you don't need ssd a regular 7200rpm hard drive will work just fine. Same with blackops you still have a timer even if you loaded up fast. This will probably go for every multiplayer game because it wouldn't be fair if someone loaded up faster then you. But for games like Crysis or GTA 4 i guess it's worth it.
There's still a lot of discussion in general about whether SSD do help with gaming performance. Does it help overall game performance? No, your GPU is still the top dog in terms of gaming performance. What about some aspects? Yes. As some mentioned, loading times are quicker, although maybe not as dramatic as you maybe would expect. If you count turning on your computer to get to your game faster then yes it helps in that respect too!