A lot of the folks that say that SSDs aren't worth it until they become as cheap as HDDs are probably the same schmucks that said that they wouldn't be getting a high-speed internet connection until it was $20 a month.
If you haven't experienced a SSD, you might want to go use one.
And no, SSDs won't make your system benchmark any faster, but if all you use your computer for is watching frame rates, benchmarking and overclocking, then don't get an SSD.
But for those of us who use our computers to "do things" and get "work" done, SSDs are a great way to save time, and enjoy our computer that much more.
And I don't know that you're going to be seeing adequate SSDs anywhere near the $100 mark, I don't know... ever. They are going to continue to need to expand (thanks, Microsoft and Adobe) and the parts of them aren't particularly cheap. The truth of computing seems to always be that the prices stay pretty much the same, the numbers just keep getting bigger. Some noob named Moore said something about that.