I don't think anyone doubted a SSD would make a difference, but does spending ~£250-£300 on a 500GB SSD (assuming you want like-for-like capacity) on top of what you're already paying for the console and games warrant a 10 second loadtime improvement? IMO a SSD of decent size is only viable if you're a) Crackers b) Loaded or c) Wait until SSD prices come down.
It's not like you're getting a worse experience than another PS4 owner out of the box.
I'm more interested in someone putting a SSHD in to see if that makes any noticeable difference, it will probably sit somewhere between the stock HDD and a SSD, so not sure that would be worth it either unless you are upgrading the stock HDD anyway.