My first camera was a well-used Spartus #4 (6x9 folder, no lens to speak of... the Holga of folders). I was 8 and it was 1962 and I didn't know better - - I thought all negatives were large enough to simply contact print. From there I moved through a host of 35mm cameras, doing some decent work, but I have always come back to MF. Nowadays, I reach for my C220 or C3 first, then think about something else second (not surprisingly, the second choice is an Agfa/Ansco 120 folder or my Zorki-4 RF).
I included this background because I have never been able to decide if it is MF that I gravitate to solely because of its qualities (all described well the posts above) or if it is because it was my first format and there is comfort in it.
My son now shoots 4x5 instead of 35mm and when we go out together, I'm now the faster of the two of us with my 120 - - not that it is a race, as we have discovered...