I think it is very important to understand the "real" differences in what it means to program vs. manage. In programming in most cases you are working on projects. Once you deliver the code that project is essentially over (minus support and bug fixing of course). In a management role many of the key activities never really conclude. For example, resource allocation overall and amongst various projects, is something depending on circumstance, you may have to revisit on a weekly or monthly basis. So you don't get the satisfaction of "delivering" anymore and items stay in your inbox much longer. This for me is the key difference.