I and my colleagues are always very, very critical of our IDE's. There's always something missing! - or crashing, but that's another story. For those of you out there who like their Add-ins as much as I do, Microsoft has set up the Visual Studio Gallery.
What I like about it: You can actually find some useful stuff there, like the PowerCommands for Visual Studio 2008. One of the commands actually allows you to copy a project, and paste it as a reference to another project in the same solution... Not exactly magic - but useful, nevertheless.
What I don't like about it: Not everything is free. For whatever reason, commercial and open-source stuff mixed together on the same website has never worked for me.