SharePoint Online (Office 365) Site Structure/Tree
In our tenant space, we have around 120 site collections. Each site collection has sub-sites underneath and those sub-sites have sub-sites in them (nested structure)
At one point, if an administrator wanted to get a structure (like a tree view or site map) which will give information on all the site collections, sites and sub-sites in the tenant space, there is no other option but to go to each site collection and add a tree view to the left navigation. It would be close to impossible to look into each site collection and use the 'Content and Structure' option in top level site administration and list them out.
If there is a way administrators/users can run a script/pull a report that can give the complete list of sites from top to bottom, that would be very helpful and awesome cool feature.
The new SharePoint Admin Centre (released yesterday) shows a complete list of sites (site collections) in one place which is great. Adding an 'Expand' option to each to show sub-sites would be a great improvement along with the suggestion above to provide a graphical view of all sites / sub-sites.