Modules for Laying Out Content-submission Forms

In reviewing Drupal layout modules, I'm left with the impression that while many exist for formatting existing content (e.g. Panels, Views and Display Su开发者_Python百科ite), there are very few (if any) that focus on changing the layout of content-submission forms - and therefore there's no alternative but modifying the associated templates themselves. Is this a correct impression? And if so, I'm curious as to why so little focus on content-submission modules. Thank you very much.

Panels will let you change the node/add node/edit forms.