Personally, there are times when I surprise myself every once in a while for doing things I didn't know I had time for such as being able to do my own pedicure or facial. It's a matter of balancing your time.
One of the biggest surprises about becoming a Mom for me was the sheer strength, will,force, and all consuming, unconditional love that unleashed itself upon the birth of my son. Before having my son, I thought myself a fairly modern, progressive, and strong woman. After having my son, (which included a three day labor, tearing, and ultimately, a c-section), I realized my mind, body, and soul housed more strength and endurance than I could have ever guessed.
The biggest surprise about becoming a mom was far more intimate than any physical or mental strength. Instead, the single most surprising thing about becoming a mom was the intense love I immediately felt the moment I heard my son's first cry, and felt his tiny, warm, and swaddled body placed upon mine. Nursing further catapulted this new love to a level of love and intimacy I never thought possible.