This is what I am going to be doing with my future crops. Growing only varieties of Squash/Pumpkins, Cucumbers and Watermelons that can be trellised so that it also provides some semi shade to leafy greens, which grow best in dappled sun light.
The primary reason is it offers more growing space for other plants and can help create different micro climates within the garden beds.
Derek Fell’s book on Vertical Gardening was excellent resource for vertical gardening, jam packed with ideas on the what to grow and how to do it.
Also, I’m 50 now and I don’t want to ruin my back by always bending for everything. If it can be trellised it will be. 
If not then… a bending we will do.
Charles I do like your suggestion of pumpkin/squash in this string of posts.