Depends on when you are riding and where you want to go.
Like so much in the modern world - the maps are very helpful -
But your choices are limited to what is there.

Advantages - bike services, some discounts, running into other cyclists, clear route.
Disadvantages - less flexibility, less serendipity, not that remote.

If you have good route planning skills and really want to get away from it all -
Then I would recommend against getting the maps.
If you need the security - they get them.