We stayed in Bettmeralp many years ago on our first trip to Switzerland together. We stayed there for exactly the same reasons you note, and enjoyed the low key nature a lot. That was the first time we tried raclette.....the old fashioned way, scraped from a large wheel of cheese with the surface heated.
On that trip we also took the 3-4 km easy downhill trail ( about 200 meter descent) from Fiescheralp to Bettmeralp after riding up to and back down from the views at Station Eggishorn.
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Nice views toward the Matterhorn, which is visible from up there. Please note that it is actually quite some distance away -about 60 km. It is not the same experience as seeing it from Zermatt or nearby.
If you are going to Zermatt in order to see Zermatt, and want to maximize your time there, then, you might be in a hurry to get there. If you are going in order to enjoy the train ride, it is a different story.
If you are intrested in some history, you will note that the route Spiez- Kandersteg - upper short tunnel - Goppenstein - Brig - Simplon tunnel- Domodossola was the first trans-Alpine rail route.
Another piece of history - at Goppenstein, there is a side road that provides access by car or bus to the Lötschental. The valley was quite isolated until a road was constructed after WWII.
In that Wiki article, quoted here, there is mention of the "Tschäggättä" which is/are a kind of "wildman" -
The Lötschental is famous for its unique local custom involving the so-called Tschäggättä: frightening figures wearing furs and carved wooden masks that walk the streets during carnival tossing soot at their unsuspecting victims. The custom developed during the valley’s long history of relative isolation, though its exact origins are a matter of debate. The first official mention of the Tschäggättä occurs in a church chronicle of Kippel dating from 1860, and witnesses the local Prior lamenting the difficulties of enforcing a ban on “the terrible misuse of the so-called Tschäggättä” .">>