I can't imagine planning a trip without consulting maps, but as you point out, some people try to do that. I hope we help them by suggesting that they take a look at a map to see how far it is from A to B to get an idea of how long it will take them to go from one place to another -- especially if they're going to drive or take a train. Sometimes that reality can change an itinerary dramatically.
I'm a hybrid map user. I like seeing the big picture that paper maps or atlases provide as well as the close detail possible in online maps. It may be possible that some people aren't visual at all, much less visual learners, so they may have difficulty reading maps of any kind. Fortunately, I didn't inherit my mother's inability to read or follow maps.
When planning my trip to Wales last summer, one of the top things on my list was to take the Snowdon Mountain Railway from Llanberis to the top and back down. I was planning to spend 2 nights in Llanberis with the train trip on the day between. I don't know what was going on, but at the time I wanted to go, the train was not going all the way to the summit. Bummer!
Without looking at a map I would never have considered shifting my route to the coast from the interior of Wales and taking the bus all the way to Tenby. Determined to take a steam train somewhere, I stayed in Aberystwyth and did the Vale of Rheidol Railway day trip instead.
Then I took the bus to St Davids, stayed there and visited its amazing Cathedral which had not originally been on my radar at all. After that it was on to Tenby where I caught up with my original planning and spent a couple of nights before taking the train from there to Cardiff.
I love traveling by train, but I also love riding the bus. The routes are the closest thing you can do to driving without renting a car. I usually make a copy of the bus or train route (map) or use a regular map and follow along, just like I followed along on a printed map in the backseat of our car when I was a kid.