NuGet for solutions with multiple projects

For anybody stumbling across this, now there is the following option :

Right-click your solution > Manage NuGet Packages for Solution...

... Or:

Tools > Library Package Manager > Manage NuGet Packages for Solution...

And if you go to the Installed packages area you can 'Manage' a single package across every project in the solution.

Use the console to target multiple projects

Tools > Library Package Manager > Package Manager Console

then use this command

Get-Project PROJECT-NAMES-WITH-COMMAS | Install-Package PACKAGENAME

for example

Get-Project Core,UI | Install-Package FluentDateTime