I started in 35MM, like most folks and loved my 19-35mm. I next went to 645, to 6x7, to 4x5, to a 40d crop. Each step of the way, I seemed to gradually go less and less wide. I think I retrained myself into thinking that 17mm on a crop was wide enough. I know the math and conversion; it just ended up this way.
Yesterday I picked up a like-new 5d and 17-40 for a deal I could not pass up ($1k). Trying out the 5d with the 17mm was amazing (again). I love the POV, DOF and perspective.
I can't wait to get out and remind myself of how much I loved WA before.