My experience is limited to product development teams, however where I've worked managers are basically tasked with people management, technical leadership and

My experience is limited to product development teams, however where I've worked managers are basically tasked with people management, technical leadership and cross-team relationship management. You are expected to know enough details about what every single member of your team does as well as what other teams are upto at a broad level, so you can act as the tie breaker when critical decisions need to be made. This is very much like holding 1000 different things in your head at a time except maybe not to a great depth. The biggest challenge I've faced switching from developer to manager is being in the middle of all that flies through your team and seamlessly context switching at a moment's notice. It's not deep concentration on one goal but simultaneously chipping away on multiple goals.