Upload & Sell: Off
I recently got the 3TB fusion drive for PhotoShop even though I keep my images on external drives as well. I'll be updating my working drive (3 TB) to thunderbolt this evening.
Not only does OSX, but LR probably uses virtual memory / swap files as does PS. With those on the SSD portion along with any of the system flies. I can wake it from sleep and before I am sitting, the system is ready for business. A cold start was somewhere around 7 seconds.
I use very little of the 3TB, but since it's a relatively closed system, I went for it for future expansion. I also got 16 GB Crucial ram to bring it up to the full 32 GB.