Looking for a Menu Module on Node Page Out site has many, many nodes included in a number of menus. When creating a node, the Parent Item select box under Menu Settings is quite long.

Is there a module that provides a better, more usable interface to selecting the parent item? I've done some searching and couldn't find anything.
I can recommend you Menu Link Weight together with Client-side hierarchical select. The combination of those two modules allow you to separate each level in an own select field and makes sorting pages within a level very handy. 

After installing both of them visit /admin/config/user-interface/menu-link-weight and select "Client-Side hierarchical select". 

This solution works very well for a site where we use a lot of levels and menu items.