I used to shoot 35mm, 100% of the time. I had a F3, two F4's and F5, the fastest f/1.4 and f/2.8 glass I could afford. Then one day I bought an RZ67 on impulse with a 80mm/2.8 and 120 back. After my first roll of Kodachrome came back I was amazed at the detail and tonality that I could never dream of achieving with my Nikon system. All my films felt like they were alive, Velvia 50 was incredible, even TMax 3200 didn't seem grainy anymore, it took on a totally different look.
Needless to say I recently bought a Mamiya 645 Pro to replace my 35mm cameras I take on trips and vacations, and now my Nikon equipment is gathering dust in my closet, among them are some expensive Nikon pro zooms, now I carry a basic 55mm, 80mm and 150mm 3-lens kit.
Also with only 10 or 15 shots per roll, you slow down and take your time, which is always nice.