[ Video yes, photography not now and probably not anytime soon. I have a 20 core machine, all cores at 3.5Ghz and a 6 core 8600k @ 5.1Ghz. I use, Lightroom, Photoshop and DXO Photolab and for the most CPU taxing thing I do which is in DXO the 8600k is 78% faster.
I use lightroom as well and if you have a decent chunk of photos to export and do multiple simultaneous exports you can quite easily max out you cores.
So for example if you have 200 pics for arguments sakes, rather than selecting all and hitting export, try selecting 50 at a time then export, then select another 50 hit export with previous settings, etc until you've got them all covered. It's a bit of a faff but you can max out your cores relatively easily.