<<" It seemed like that there's a lot of hopping on and off a bus/train/gondola/cable car etc... Yeah, it can be overwhelming.">>
Once you are there, you'll find that an effective public transport system makes life a lot easier. You get used to expecting to have a fast train every half hour between the major cities (and slower connections with more local stops at intermediate times) and a train or bus once per hour at a minimum almost everywhere. Even the most remote valleys have some kind of public transport. It is a social policy of the Federation government, and helps the cohesion of a very diverse country. Because more people have cars, some of the weekend "hikers buses" to trail heads have been cut way back, but they still run.
However, to use it easily, it helps a lot to have some sort of basic idea of the geography- where the cities and towns and regions are in relation to one another. Then, they are more than odd sounding words. On screen, in addition to Google Maps, I find Mapsearch.ch to be useful. In particular , the train lines are very clearly visible once you zoom in to the right amount ( z=32)
Often, when I show my ticket to the conductor, he or she willl say- usually in Engish - "change at Bern" or words to that effect.
And, on the Golden Pass route from Montreux, you will change at Zweisimmen (and sometimes at Spiez), then at Interlaken Ost (where you leave the main line and change to narrow gauge cog rail trains that go into the Lauterbrunnen Valley. There are two rack sections as you near Lauterbrunnen.. You'll hear the difference once the trains go on the rack - the cog rail sections at two places.
You don't have very many major destinations, even so, perhaps a paper map in your pocket with the whole country on it could be helpful. A smartphone map, such as Google Maps can certainly do the job, especially since you have teenagers with you, but a not terribly detailed map of the whole country can give an overview in one glance.
One thing that I would do immediately upon arriving in each destination ( although it would be hard to do in Geneva) is stop at the tourist info office and get some kind of local map, perhaps a walking map of the city, or a map of the the Jungfrau region such as :
www.swissholidayco.com /Public/Assets/User/fi les/Map-of-Jungfrauregion1.jpg
Unfortunately, the time you'll need it most is on your short time exploring Geneva. I, and my wife both set out at different times to do that upon our arrival days from the East Coast of the USA on our first trips, and jet-lag caused us to become totally lost. A day or so later, we had no problems finding our way.
Your hotel will surely have some kind of basic map. Even that will help. And, Station Rive has a lot of tram and trolley-bus routes stopping there.
Since I stay in Zürich frequently, I have bought a detailed street map for Zürich which shows the tram and bus routes. Because there are many, it is useful to have a map that you can spread out to see the while set of options.You most likely won't need it.