Hmmm - I am an engineer, and probably in a slightly different boat as I got pregnant so I could stop working!! LMAO!
I have been working for about 9 years now professionaly, and I was over it. Over work, over the day to day crap, and just sick of dealing with stupid men all the time.
I still worked to 36.5 weeks, and I should have stopped earlier. I ended up being really disjointed from the whole pregnancy experience, and I found I didn't really get a chance to prepare for the baby emotionally.
In saying that - a week after I finished working, I was back in at work to tidy a few things up!

I was very lucky in that my DP has been on workcover sincelast June, so we have been share parents. Its been great for me cause I've had a totally free experience, with only a little bit of stress in it all.

Financially things got too tight for us, so I went backto work in Feb, but it was only a short term thing until I could get pregnant again. So I'm still there, hoping to resign in a couple of weeks time, cause I'm really into staying at home and seeing my daughter grow up.

After this baby comes, I will be going back touni to retrain as a seconday teacher, but I refuse to start uni until he/she is 6 months old at least. Those first few months are too precious, I want to make sure my child can wave goodbye before leaving it onea daily basis.

So with regards to will you feel the work mojo return? Maybe - but I think it all changes where you know now that you work to live, not live to work. These little guys are so special, for me it seems like a waste to leave them with someone else to care for them. But thats just my opinion, and again, professionally I was in a very different head space.
I am pleased to say now I rarely do more than a 40hr week Previuosly I was 55-65 hrs without overtime.