I understand the feeling.
I did 12 years on active duty, and I'm now going on my sixth year in the reserves. Since I still have one foot in the civilian world and another in the military world, I see both at the same time.
When I first left active duty, it was a huge relief. I was able to spend a lot more time with my family, my civilian job was a lot less stressful, and I truly enjoyed fading into the civilian community and the normal life.
As time as gone on, I find myself really missing being full time military. When I am on Drill Weekends or on military orders, I find myself much more satisfied with what I'm doing. The work is far more rewarding. I was mobilized to Afghanistan for one year not long ago and since I've come back, that feeling is even stronger. In my reserve life I get to do some truly amazing things, see stuff even cooler, and work with some very sharp people. I truly miss my military time, and would go back to active duty in a heart beat if given the chance.
My only concern would be how competitive I'd be in my military career if I went back full time active duty. I've done well and been successful, but many of the youngn's I've met lately are brilliant and make me feel like a knuckle dragger.