Totally agree with scottishmummy and working9while5. You do click back into it. My DDs are teens now and I have always worked FT. (No guilt, though occasionally I envy my SAHM friends for their coffeetimes if it's a nice day..) in fact I have to tell you that they recall virtually nothing of those years when they were at nursery and "being raised by other people", ha!
My DDs are proud of the fact I'm working and have told me that consistently. I was lucky in that I didn't have a commute and DH and I have always parcelled out tasks 50/50. We'd diarise ruthlessly so each of us could stay late at work twice a week if necessary. Oh, and weekends are pretty much sacred. I'll check the blackberry so that I don't have a Monday morning crisis but that's it.
The first 5 years we were broke. Childcare took up virtually all our money and we couldn't afford holidays or anything but the most basic DIY on the house. But that passes; I am now in a senior role in publishing and am now so used to working at top speed I have become very efficient at home. The advice upthread about getting stuff ready on Sunday night is spot on!
I strongly recommend Sheryl Sandberg's Lean In which is very good on giving tips on how to look at your career and not be scared of going for a senior role. Women hold themselves back too often and we need more women doctors, financial directors, head teachers, lawyers etc. Don't feel guilty about your achievements. Don't ignore office politics - I'm not advocating crappy political behaviour here but watch how the men behave and make sure you're in the room for every major decision. A lot of women don't play the political game (sanely) but it's important to be able to read it.
The best thing I did in retrospect was forego a bonus 6 years ago and instead negotiated extra holiday which I still have. Obviously this is dependent on your industry - teachers couldn't get this but worth considering if you're in professional services.
Sometimes I think that some women feel doubly guilty - first for being a mother at work and secondly for being a woman who's good at her job.. The more senior you get, the more you can call the shots. If I have to go to their school, I just go. If I had been PT and had not progressed I would have had to get official time off, permission etc.
Best of luck to all of you going back 