Same. Before I found Highcharts, I'd switch between a few different graphing libraries, based on the needs of the project. I'd always find that each graphing library had its own set of limitations - there'd always be something it couldn't do (besides D3, where you can do basically anything - it's just quite complicated).

Highcharts was the first library I found where, even when I assumed what I wanted to do would be impossible, it could do anything I threw at it. The number of settings and formatting options is incredible. Such a fantastic library.

(By the way, for maps, there's Highmaps. It's an additional license fee but it integrates nicely and provides a bunch of cool choropleth map features, etc).