> once you get into the habit of using a new map+navigation service it seems quite hard to switch or is that just me?

I don't think it's just you. :) I know a fair number of iOS users who switched to the standalone Google Maps app during the, shall we say, rocky first year of Apple Maps, and who I've never been able to convince to look back -- and these are people who live in the San Francisco Bay Area, where Apple Maps is arguably at its best.