Your work is part of what makes you who you are. If you love it, don't feel guilty. Embrace your dual roles, and your children are likely to follow suit. A dad who is too distracted by work can contribute to behavior problems in kids, but children benefit by mom's involvement in her work. They're more likely to see the value of working hard at school, for example.
Sufficient relaxation is crucial for working mothers.
With that comes an enhanced capacity to attend to kids' needs. The brain works in odd ways. People get their best ideas driving, in the shower, jogging, brushing their teeth. So maybe you get yours playing catch or reading Goodnight, Moon . Skip the guilt, and pat yourself on the back for your being so efficient.