Here is a justification from MS to remove Design view
http://blog.sharepoint-videos.com/sharepoint-designer-2013-data-view-web-part-list-view-web-part-design-view-is-gone/
If you are a Power User who loves working with and creating no-code solutions on SharePoint, you are the one most affected by this change. There is no replacement for the functionality lost in any other product that I know of so far. SharePoint Designer
was it and now there is none! In SharePoint 2013, there will be no other built in functionality that will let you manage these no-code solutions visually. If you know of something I dont, I would love for you to comment about it below.