A nuance I felt -- when you're an IC the 'I'm being productive' feedback loop is really quick and thus satisfying. You can come in the morning and have measurable problems you solved by the end of the day. As a manager, feedback cycle gets longer -- you're investing in trying to make your team more effective over the long-term. The things you work on on a given day might not be measurable as 'working' or 'productive' until several weeks or months later.

I found this feedback cycle image helpful to keep in mind when I'd get frustrated as a manager feeling i'm "not as productive as I used to be". Also helpful for prioritizing what gets worked on.