Overall, we very much recommend the trip. Switzerland was as gorgeous as you imagine, and we found it easier to visit than we had feared. I really do recommend Valais as a region in which to base yourself- it is a place with TONS of personality, and where the two tallest Swiss mountains are. If you like hiking and trains you will be in heaven, and it's possible to do on a general 'Europe' budget.
That's a tough act to follow, but the Netherlands is truly equally rad. They were worthy partners.