Is there any risk in allowing your team of developers to install whatever Visual Studio Add-ons they want? Is it a good idea to allow them this freedom?
I am a developer and I strongly agree with Jim.
The plug-ins I use in Visual Studio make me more productive and make development smoother.
The moment I get told what makes me more or less productive and how I am allowed to setup my IDE, is the time to move to a less far sighted firm.
The plugins are created for a reason, use them and make life faster and easier for your devs.
Performance. Some of these addons seriously impact the speed of Visual Studio. Whenever someone complains about their Visual Studio being slow my manager first asks them to disable all addons and see if it's any faster. Often it helps.
But we're pretty free to use what we want. And I can't imagine having to work without Resharper. Even though it somewhat slows Visual Studio I'd be annoyed all day having to work without it.