The author asserts that Visual Studio is a much better development platform than everything else. I use IntelliJ, emacs, Unix cli, Perl, etc What am I missing? I'm sure Visual Studio is good but even if it's better, how much better is it?
There are a lot features related ot other MS products - SQL server, TFS (source code control, bugs tracking), Active Directory, etc.
The ultimate edition comes with web/load test tools. You can record some actions in Internet Explorer, than VS can create a coded test perfroming all the requests and testing the responses.
VS has a historical debugger, called InteliTrace. It can show you the state of an app at any previous point of execution.