I just bought a 1st class Swiss travel pass through raileurope. I see comments in years past that reservations are not needed. Is this still true? This is my first time using a rail pass. raileurope gives the option to reserve, but it's $12 per connection, plus processing, and a charge to mail paper tickets

I'll be traveling:
Zurich-Interlaken
Interlaken-Montreux
Montreux-Geneva

Thanks!