I think if I were in your situation, I could probably do the same thing you're doing. I have a work issued laptop that I could use as my full computer......but unfortunately it's an old Dell Windows 7 PC. It's actually still a pretty fast machine for some reason, but I just really can't stand Windows. Also, technically, we're not really supposed to use our work machines as our personal machines. I like to keep work and home separate (even though I actually work from home full time). I used to have a Mac for work and logged into all my accounts on it, and one day the hard drive crashed completely. I had to give it back to IT, and never had a chance to log out of all my stuff or deactivate it from my iCloud account. I had to call Apple and get them to do it. That's another situation that concerns me about using work machines for personal use.
Thats understandable. The department I work in, functions outside of the IT department as far as computers go. We are the only ones who use macs for the most part. In fact, Im the only one who has the password for my computer. Its pretty much mine to use as needed. I don't do much personal stuff with it, but I use it to receive iMessages, stream my iTunes music. I also keep my work related documents in iCloud so I can work on them wherever.
I also have a TB display in my office. The mac is used like a desktop until needed else where. I have been using it for meetings lately since the iPad mini just can't keep up with meetings speed wise anymore.