Thing is though fudge, you don't really store gigabytes worth of photos on your SSD... so yes, LR will start faster, and the computer will in general be a lot more responsive, BUT your bigger storage is still going to be a spinning platter unless you're made of money and can afford a few 500+ GB SSDs.
If you do get an SSD, storing your LR catalogue on the SSD itself will help, as with the preview cache. Keep the actual RAWs on a proper hard drive, as LR doesn't actually access those unless it's building previews or exporting JPEGs. The wedding photography forum I belong to did some speed tests and found no noticeable speed increase by storing RAWs on the SSD - max speed was actually using SSD+HDD together, and making sure to render at least standard-sized previews for all your photos on import.
Canon EOS 5D MkII | Canon EOS 7D | Canon Digital Rebel XSi | EF 35mm f/1.4L | EF 50mm f/1.8 II | EF 85mm f/1.8 | EF 100mm f/2.8 Macro USM | EF 135mm f/2L | EF-S 18-55mm f/3.5-5.6 IS | 580EX II | LumoPro LP-120My Flickr