With regards to SSDs an gaming: loading times can of course be improved dramatically, but the framerates should be the same. Why? Because as long as you have plenty of RAM (which you do) there is no reason why the game should be accessing your harddrive during play. All the necessary information is transferred to your RAM during loading, after which the harddrive is not used much anymore.
So I think the improvement in framerates is the fact that you're now playing on a clean install of Windows 7 instead of an old, cluttered install of whatever you were using before.
Anyway: I agree 100% that an SSD is far the best thing you can invest in to get a quicker and more responsive PC in general!