I like both maps and gps, and each has a specific use.
The map is great at breakfast, when over coffee you can look and get an overview of what you will be doing that day. I love seeing the topography, little towns, all that. While "take the 405 to the 101 to the 126 exit main and go three blocks" is accurate, it does not help with an overview, especially for one who is unfamiliar with the area. You may miss too many places you might want to stop in on along the way.
The gps is great in the moment. I'm lost, need gas or food, and would prefer not to pull over, get out the map and reorient. I can search and get corrected turn by turn to get there all from the saddle. With my Bluetooth helmet, I can call the hotel to check on availability while enroute.
I like that you can use gps in the pouring rain, where a map might get soggy pulled over to the side of the road unfolded on your tourpack. I like that a map shows distance and time lengths. I like that the gps can give you traffic or road closures (if you update). I like that a map can be shown to a non English speaking person who can then interpretate and give directions.
At the end of the day, I like to sit down with the map and see how much we did or didn't do. I like that maps don't crash, wig out, or need a charge. I like that a map does not require a cord to charge overnight.
I like and use both.