Sharepoint - Adding images to wiki pages is very time-consuming task
I hear all the reasons why SharePoint doesn't support this, but this feature is currently the difference between our users using the SharePoint wiki and not using it. It is a shame too, because it has lots of benefits, but there are no benefits if no one uses it.
In Office 365, both the OneNote and Outlook web applications now support pasting images in the web browser, and users expect that functionality throughout Office online.
Maybe it could be a feature that can be disabled for environments where reuse of images is important, but it sounds like it would greatly benefit a large number of users in environments where that is not as critical.
Until Microsoft fixes it, we have found that OneNote online is the simplest way of providing this feature. It lets users create a wiki-ish set of pages to share knowledge, and it includes the ability to paste images into the online version without uploading and inserting them.
There is a reason for this process. When you use an Enterprise content editor such as the Wiki portion of SharePoint (or Article pages for publishing sites) it is supposed to become a repository of all the items, text and multimedia and thus making it reusable.
By placing it and coding it in an asset library (or image library) you are de facto making it re-usable. Pasting it into the page will not do the same job.
The system has been designed to create virtuous circles of storing data and make date resurface in the form of a wiki page, search results, results from content queries and search.