Since you have no use for the fancy-schmancy stuff -- most of your work is in 2D, and the card acceleration is only good for ray-traced 3D -- that's about it -- you're better off sticking with CS6. However, I WOULD check to be sure that your version of CS 6 is fully updated.
Plus, you get a bonus for sticking with CS6 and not going with CC: you won't have to owe Adobe somewhere 40 bucks every month just to keep using AE. You can't buy their software any more, you can only rent it.
But at least now you can make that "to rent or not to rent" a little further down the road; you don't have to get sucked down the rental vortex just to play with features you don't use at the moment.
To counter Dave's suggestion:
There are hundreds of bug fixes and useful changes in After Effects CC (12.0, 12.1, 12.2, and the upcoming update). Staying with After Effects CS6 means never getting these improvements. Note that most of these improvements are not "fancy-schmancy stuff" as Dave suggests, but focused improvements that are meant to reduce the difficulty and tedium of using After Effects.
The same is true for Premiere Pro.
Details for the past several incremental updates to After Effects are in these pages:
Thanks Dave. I just read through the four updates and I'll never use the fancy-schmancy stuff either. Plus, as you pointed out, I don't do enough to justify the extra cash outlay.
I read this post on another forum by Harm Millaard:
I've been busy writing articles about hardware choices for editing with Premiere Pro, as you may have seen here: Tweakers Page
I hope it is a treasure cove for people looking for a new machine and doubting the suggestions they have been given, or want some background info on how to setup a balanced system for their editing needs.
I'm still on CS6, which was paid for in full before CC arrived and I see no reason yet to change to either Avid or Edius, since CS6 does what I need it for. Upgrading to CC makes no sense, since I'm only editing HD and have no need for XAVC or H.265 yet. Just staying on MC CS6, which I upgraded to for $ 480 and is a perpetual license, saved me around $ 450 in 11 months by not going the CC route. Monthly savings here are around $ 85 by NOT subscribing to CC. Those savings come in handy, when you need a good shoulder rig (Vocas) for the camera, XF300.
I think that sums it up nicely. But he will still have to hold that stance for another 10 months to break-even on that shoulder rig, according to my calculations. Then he will have it for free, compared to a CC subscription.