I have found that without an office manager, it is difficult in a small practice to be the doctor, boss, owner and discliplinarian. It is just hard to work so closely with three or four employees where any feedback at all has powerful repercussions.
And, the pendulum has swung so far toward the rights of the employee, it is like they have unfireability insurance. I figure now it costs me about $10,000 to fire an employee. Hell, it costs the same to hire one who quits.