I think, in short, it is incredibly easy to put down on paper all the reasons not to have children and incredibly hard to put down all the reasons to have them.
I'm younger than you and we'd always wanted to have children (in principle) but had similar concerns to you. Both I and DW worked long hours and had to travel with work at very short notice. We both loved our freedom to go out whenever we wanted, wherever we wanted, either together or separately to places that would be just impossible to take children (e.g. gigs, climbing, nice restaurants and bars). We both hated the thought of that changing, especially the loss of freedom. God, I didn't even like other people's kids, just found them nail bitingly tedious and annoying.
Anyway, there was 'something' that both made us want to do it and so we did and now we have an absolutely gorgeous wonderful and fantastic little girl.
Now, like I said, on paper it's easy to list how things are 'worse' now. Everything has to be scheduled in advance, even a quick drink after work. Gigs/ dinner/ clubbing are now once a month (if that) with babysitting arranged. Holidays are based around where's best for DD not simply where we'd like to go. Our car is practical rather than gorgeous and silly. Lie-ins have largely disappeared and our TV is permanently tuned to CBeebies instead of Sky Sports. There's less money to go around than before, you worry about it more and you are more financially co-dependent.
BUT two things.
Firstly, your old life doesn't end, it just changes. We still go out to nice places. We still get stupidly drunk. We still see friends for dinner. We still both work pretty much full time. You do it less and it has to be a hell of a lot more organised but you don't give up everything you had before.
Secondly, and this is the important bit, in addition to what you had before, you have this fantastic little thing in your life which brings not only unconditional love and happiness with them but new experiences and a completely fresh aspect to life.
Life before kids is wonderful, absolutely, but I do look back and think "So?" How many great restaurants can you eat in/ rock faces can you climb/ bands can you listen to/ beaches can you lie on etc etc. before they just kind of blur into one. In ten years time, you might still be loving what you're doing but will you just be doing exactly the same stuff still and wondering if that's all there is to life?
This is absolutely not to say that you should have kids by the way or that you should have them just because your wife wants them. It's simply to say that trying to rationalize having kids impossible, it's much more like St. Augustine's leap of faith!