For years I didn't like shooting medium format, and 4x5 was way to much hassle. I would only take out 4x5 for a preplanned nature shot. As a project.
I tried a C33, an Agfa Clack, Bronica S2, a Yashica 124 and others. I loved the size of the negatives, They are a nice size to hold and you can see what's on them, easily. But I did not get along with 6x6 even though I love taking square format pictures on iPhone. I shot Leicas and Lomos and Nikons, but was always frustrated by the size of the 135 negative.
This summer I treated myself to a Mamiya 7, and everything fell into place. I took the 7 and the iPhone on a trip to Iceland and did not miss any other camera. Came back with a bag full of rolls. It is the medium format, middle of the road, not to big, not to small, easy handling. Nothing technical in the way of the shot. I can carry plenty of film, yet still slow down my shooting sufficiently to think. I can carry it around all day, because I notice that I need to have the camera in hand to see actively. If it is in a bag or over my shoulder I relax for much.
I started enlarging the summer prints yesterday. I love the details. I like enlarging to 30x40cm, for purely 8X10 enlargements I probably wouldn't see much difference to 135. But a bit larger and many 135 negatives fall through. With 6x7 I can still crop and retain quality.
I still carry around a Leica M4-2 as my daily beater. It lives in my daily bag with a 50mm and 90mm. The Mamiya is to large for that. I am dreaming of a nice Agfa Isolette, though....
As for 4x5 I have not given up on it. I have a Horseman with a pouch of 5 film holders. But I wonder when I will want to use it. The thing I think works with TLR´s and field cameras, is that they may be better for portraits because they break down a bit of the stigma of normal cameras. People are interested to sit in front of them and watch you working.