If your workload doesn't often put the disk light on for seconds or minutes at a time, you might not see the advantage from moving to an SSD.
Exactly.
None of my data is on my system drive, so an SSD won't have a significant impact on throughput. Programs will load faster, but even with my technologically ancient IDE hard drive Excel loads in 1.4 seconds, MS Word takes 1.8. I see no likelihood of increased internet speed just because my storage device has no moving parts.
And yes, I could restore functionality to my computer after a catastrophic system drive failure (is there any other kind with a SSD) in about an hour...
provided that I had another SSD sitting on the shelf waiting to be installed! Otherwise I wait for NewEgg to ship my new SSD to my mail forwarder where it will languish for anything from 10 days to a month clearing customs before I actually have it.
SSDs might be great for some (most?) people, but for me, not so much.
tanstaafl.