Since you asked, I'll give you my opinion ... you may be sorry!
Kicking and screaming last year, I got the Photoshop/LR plan when it was offered - because I usually upgrade both every other year and, for at least the next couple of years (until Adobe raises the cost of the subscription), it was going to be more economical. However, the idea of renting software really .... frosts my cookies ... and I have kept my CS6 installed in case I decide to stop the subscription.
One of the biggest issues with the subscription is that when you stop paying you lose the software. So depending on the kind of upgrades they make to CC along the way, your PSD files may not be compatible with the older licensed version you previously purchased.
As designers, some of us probably use a few more features of Photoshop than the average scrapper/art journaler, but the reality is we don't even scratch the surface of what Photoshop can do. It's a bit like buying an elaborate countertop oven that can bake, roast, broil, toast, convection bake and microwave, but only using it to make toast. Way overkill for what we need but very impressive to own.
I feel that as consumers (me included) we've bought into the notion that we must have the latest and greatest - I'm a poster-child for that because I probably have (or have had) every tech gadget ever invented. So the idea of having the software constantly upgraded under the subscription is very appealing. If I'm being very honest though, I would have to say that the upgrades to the CC since I started the subscription have had almost no impact on how I use Photoshop. Most of the upgrades are geared towards graphics people working in completely different industries and environments. There have been one or two "nice to have" improvements, but so far nothing at all that affects our industry. (The same is true for LR upgrades.)
Additionally, as the software gets more and more sophisticated, it takes a more and more sophisticated (and therefore expensive) computer to be able to run the software efficiently. I'm quite technical and know all the tricks to tweak Photoshop and my iMac to get it to perform optimally, but there are still times I want to pull my hair out just trying to save a PSD or switching to the Type Tool.
Frankly, I think the biggest improvements in Adobe software have been to Photoshop Elements. I started using PSE 2 and have purchased every version up until 11 and the upgrades have been amazing. As a designer, I need more control over layer manipulations (more extensive layer style control, for example), but if I were just starting out and comparing the value between the two programs for how I use them for, PSE would win hands down.
There are probably only a small handful of useful upgrades from CS5 to the current CC version and practically nothing from LR4 to the CC version. So the questions to ask yourself, are what is it that you can't do now that you need to be able to do and how old is your current computer (how fast, how much RAM, etc.).
Of course, this is just my opinion - so sorry to go on so long - but hopefully this gives you some food for thought.