By far the biggest thing people remember about Google+ was the hamfisting of it (several people lost their Youtube accounts) and yet people also reported that it was otherwise a good experience (compared to the Facebook feed); one thing Google had to contend with was Facebook not offering access to the social graph so they had to build the network effects by a more difficult route
Google also spawned a second one for me from my original gmail address, but I still use my original pre-google+ youtube account. After signing in to that google account on any given device, I have the option to switch between the two youtube accounts associated with the email.
It's good that you have access to both; out of curiosity, is there any differentiation in the way it list them in the menu where you pick which one to use, or is the order consistent? I can imagine being mildly annoyed if I had to guess every time I logged into a new device which one was the one I wanted, although obviously that's still better than just not having a choice.
The one created for google+ is usually listed first. After signing into my google account on a new device, the google+ one is also the one that I'm usually automatically signed into.
If Google had any direction and purpose, it could have kept not fucking up Circles until Facebook (almost inevitably it seems in retrospect) messed up.
Can I just say, the comments that have happened here before mine, have been stellar. Wow. And also, it's so weird to have some nostalgia for all of this now...