We recently published a series of blogs (with one more to go) aimed at helping JavaScript developers wanting to migrate from Google to ArcGIS come up to speed on the JS API:
Have you gone through the experience of migrating from Google or are you considering starting the process? This GeoNet post serves as a way in which you can provide feedback on the above blogs, as well as share your experience coming up to speed on ArcGIS. How can we help?