From using one, SSDs have made a difference, but to be honest I can't say it has been life changing. My PC starts up quicker and programs appear faster when called on.
However when I see videos on YouTube of the BIOS flashing by and the splash screen not showing it makes me wonder if mine is configured correctly.
My system still goes through the BIOS, checks the RAID, etc and my Windows screen still appears. It takes almost 1 minute to actually get from pressing the power button to logging in and using the system.
The issue with SSDs is that it seems people are afraid to use them fully moving the user folders to the slower drive for instance. They also slow way down when they get too full.
However I think they are more than a passing fancy, especially in laptops. My laptop has an SSD now and it feels much different there than my desktop. It is a seven year old Core 2 Duo system and it feels far more responsive now.