That's a very nice machine, and will not be slow, quite the opposite!
The new SSD's in the new MBP's are amazingly fast... they are PCIe and run up to 980MBps, yes almost 1GB in 1 second! Great for working with large RAW images off the disk.
I have the brand new late 2013 15", which does have the Quad Core instead of the 13" with Dual Core, but you will have no issues running basically any photo software on that machine.
Actually I also previously had a 13" non-retina late-2011 machine, with SSD, and it was really fast (I ran Photoshop, Lightroom 5, Photomatix, Auto-Pano Giga, all no issues).
Thank your wife!
Canon 5D III, Fuji X100s, Sigma 15mm (Fisheye), 16-35 F2.8 L II, 24-70 F2.8 L II, 70-200 F2.8 IS II L, 100 2.8 Macro L, 1.4X TC, 3 x 600 EX-RT, ST-E3, Nodal Ninja Ultimate M2 with EZ Leveler
http://www.flickr.com/photos/ryanruel