I also own a Ford Econoline with a hightop and extended body. Parking lots can be a bear to get in and out of, especially if your trying to back out of spots. For me atleast, the issue has more to do with the lack of windows my van has for me to look through, forcing me to rely almost completely on my mirrors. It can be super nerve wracking when you in a parking lots with lots of foot traffic. I just can't see them sometimes. Also I find that I haveto pull it partially into the space directly in front of me to avoid the *ss end stick out too far.
My Dodge SWB and LWB standard were (are.. I still own the shorty) ALOT easier to maneuver around parking lots. They were better off road because of the lack of overhang that an extended has, and if you installed an LSD, good tires, and made sure the front/rear weight bias is as equal as possible, you can go up some seriously sketchy looking mud roads.
But I love my Ford... I find the extra length and height over a standard body very useful, and makes for a better experience if your gonna live in a van. I take the comfort of my Ford over the ease/versatility of the Dodge.