When I booked the tour, I was a bit hesitant to pick Titlis over other tour destinations in Zurich, as it is a “too mainstream” of tourist destination.

It still is.  But apparently there is a strong reason why millions of tourists coming to this place every year: the view from the top is absolutely stunning. Magnificent. You kind of feel climbing the Alps Mountain but with much much less effort. In fact it was probably no effort at all, as you took cable car ride which offer you spectacular view from Engelberg to the top.