The worthy-ness of your upgrade much depends on what you starting form..... above it was noted that the user's boot time went from to 8-10 seconds. The 10 seconds seems a bit optimistic (Best I have seen with a tier 3 SSD is 15 seconds ..... tier 3 = fastest available 120/128GB units).
http://www.tomshardware.com/reviews/buy-ssd-recommendation-value,3088-6.html
That 1 minute time is something I can sympathize with as my lappie takes longer than that ..... but for example, on Son No. 3's box, his machine booted in 21.2 seconds off a 2TB Barracuda XT HD..... adding a Vertex 3 Max IOPS (Tier 3 unit) dropped the boot time from 21.2 to 15.6 seconds.
I loaded the Saga of Ryzom MMO (chosen cause it's a self contained application and doesn't have registry entries so easy to run off any drive) off both the SSD and the HD .....and with 5 tries opening the game each way, they both averaged about 45 seconds ....... the HD actually won 3 outta the 5 tests but in each test, the difference was less than a half second and easily attributable to reaction times hitting the stop watch.....then again, could be the netweok server handshaking that is the bottleneck so laod times don't matter.
So yes, an SSD would improve my experience on the lappie, but my son hasn't been as impressed with his 5.6 seconds per day savings. He figured out that if it lasts 3 years, it will have cost him about $3 per minute in time savings.
Now in your case w/ CS5 and Premier Pro, I'm sure that the improved response would have a greater effect on your activities than his.